쉐도잉 연습: There's a Giant Hole In Earth's History - 영상으로 영어 말하기 배우기

연습 모드 선택

각 모드는 전체 화면 연습실로 열립니다.

114 문장

문장이 너무 짧거나 길면 Edit를 눌러 조정하세요.

Hey, 42 here.

If you've ever found yourself flipping furniture as you search frantically for your car keys, you'll know how easy it is to misplace something.

Maybe you lost your phone, your wallet, or the will to live.

But of all these, the biggest mystery is how we lost a billion years of history.

This is far more serious than when you found your keys in the bread bin, because there's a colossal blank spot in our planet's past,

and nobody's quite sure where we put it.

To put things into perspective, a billion years is almost a quarter of Earth's existence

and yet there's a billion year gap in the fossil record that geologists call the Great Unconformity.

Let's dig a little deeper, shall we?

Speaking of which, if you ran outside right now and started to dig, you'd uncover older layers of rock the deeper you got.

First, you'd find an Alanis Morissette tape from the 90s.

Maybe a disco ball from the 70s.

But eventually, you'd excavate some Roman coins and other assorted artifacts.

So, why is it that both human and natural remains sink deeper into the Earth as time passes?

Well, the Earth's surface is constantly being littered with fine particles like sand and dust.

This sediment accumulates in an agonisingly slow process called deposition.

Then, in another process called cementation, these mineral particles gradually bind together until, a few million years later,

and sedimentary rock is formed.

Then, another layer of rock forms on top of that, then another, and another, and so on, until the ground beneath your feet is like a trifle.

A rock trifle with millions of layers made over millions of years.

And not a single one of them contains custard.

What a tragedy.

But during all this sedimentation and cementation, animals are doing their usual party trick of dying.

All the soft, squidgy bits get eaten or decomposed, but sometimes the harder bits, like bones, shell and husk, get covered in dust.

slowly succumbing to the sedimentation, thus becoming encased in rock.

Over time, water penetrates this rocky tomb, which dissolves the biological remains within.

Eventually, minerals fill that void and form a fossil, which of course is just a rock replica of the creature that once resided there.

Importantly though, that fossil is frozen in time, enshrined in the sedimentary rock from the era in which the animal lived.

Much of our understanding of the history of the planet

and life itself has come through studying the sequence of sedimentary rock layers and the treasures they've trapped through time.

Often the different layers, called strata, are clear and distinct, with each revealing something unique about the age it was formed in.

The stupendously fun pastime of studying strata is called stratigraphy

and one of its guiding principles is the law of superposition

which states that

if undisturbed the lower down the rock layer the older the rock not exactly rock it's science

but it does mean that generally

when you're looking at a cross section of geologic formations you

get a fairly neat picture of the passage of time but unfortunately history isn't so predictable.

Whilst new layers of sedimentary rock are being formed in one location, in another conditions can change, and sedimentation just stops.

Wind and water erosion can move particles elsewhere, effectively deleting part of a geologic record.

After a while, sedimentation might resume in that location, but these temporary interruptions will forever leave a gap in that rock's record,

and sometimes that gap, called a hiatus, can be millions of years long.

It's like hitting pause, rewind, and then record again whilst in a very long conversation.

In the final recording there will be missing parts that are irrecoverable

and if these parts are integral to the meaning of said conversation then the whole thing will no longer make any sense.

When these hiatuses happen it creates a noticeable difference in the angle, colour, and texture of the new rock that sits on top,

as can be seen here and here.

Geologists call this feature an unconformity.

It was Danish man Neil Steensen, considered the father of stratigraphy, who first sketched an unconformity.

back in 1669, but it was a Scottish farmer called James Hutton who discovered the first significant unconformity.

Whilst walking near Sicca Point in Scotland in 1787, he noticed a striking difference between the lower and upper rock formations,

and so he coined the name for it, Hutton's Unconformity.

If that name sounds a little rude to you, but you're not really sure why, join the club.

anyway the grayish lower layer of rock is made up of deep sea deposits from around 425 million years ago

but the reddish upper layer was deposited by rivers and streams about 345 million years ago

that's a hiatus of about 80 million years it was on the back of this discovery

that hutton helped develop some major theories about the movement of tectonic plates

and the forces that shaped the face of the earth.

Some geologists call Sicker Point a geologic shrine,

which tells you how incredibly strange both this formation and geologists actually are.

However, the most unusual unconformity was found in 1869, when John Wesley Powell was observing a strange mound.

Whilst traversing the Grand Canyon, he noticed a vertical rock formation butting up against horizontal formations.

Channeling the supreme creativity of his geologist predecessors, he named it Powell's Unconformity.

But since then, it's been more commonly referred to as Powell's Great Unconformity.

And there are two striking reasons why it's deserving of a great.

Firstly, the unconformity actually spans an entire continent, stretching across Laurentia, which is the name for the ancient heart of North America.

Secondly, many other unconformities had been unearthed around the world at this point, but they mostly represented small gaps, on a planetary scale at least,

maybe tens of millions of years.

But the smallest time gap between the two rock layers in the Great Unconformity is a modest 250 million years.

And the biggest is over 1 .2 billion years.

That's right, that missing piece of prehistoric pie sandwiched between these two unassuming

rock formations represents up to 1 .2 billion years of missing history.

And we have no idea where it went.

But there's so much more to this rocky weirdness.

Since Powell's grand discovery, a few more formations have been found all over the world

that have the same time period plucked from their record.

Together, we collectively refer to these as the Great Unconformity.

It's a mystery that spans the entire planet and over a billion years of missing knowledge.

Take the Grand Canyon example.

Here, the 525 million year old Cambrian era Tapiet Sandstone sits

snugly on top of the 1 .7 billion -year -old Visnu Basement rocks, dating back to the Precambrian era.

Like I said, a time gap of 1 .2 billion years.

Weird, right?

Scuttle over to the Ozark Plateau in Missouri, where we see a similar site.

500 million -year -old sandstone sits suspiciously atop 1 .4 billion -year -old granite,

representing a 900 -million -year hiatus.

For the sake of all that is igneous, what's the metamorphic heck is going on here?

Well, some have suggested a theory to explain the great unconformity, and it's called the Snowball Earth Theory.

It refers to a time during the Cryogenian period, around 650 million years ago,

when the Earth's surface was thought to be covered by glaciers and ice sheets, like a giant snowball.

Glasses are capable of causing erosion on a massive scale as they grind across landscapes.

And it's been estimated that they collectively removed two to three miles from the Earth's surface.

Basically, the Earth had its face exfoliated.

Now, do you remember me saying that the younger rocks

that sit atop the Great Unconformity all around the world date back to a period called the Cambrian period.

Well, what's really interesting here is that the Cambrian period was when the biggest explosion of life in our planet's history took place.

During a tiny timeline of only 11 million years between.. approximately 541

and 530 million years ago the original ancestors of almost all

the life forms we currently know today sprang into existence for example this is when fish first appeared

100

there was life before this event sure but this short window was

101

when mother nature downed a red bull snorted some cocaine and hit the big evolutionary boost button

102

so how does all this relate to the snowball earth theory well

103

when all these ice flows started to hit the ocean they

104

deposited gargantuan quantities of nutrient -rich minerals into the water where

105

the theory goes it was responsible for the aforementioned explosion of

106

life over 1 billion years of sedimentary rock was just carved

107

from the face of the planet by glaciers then plunged into evolution's breeding ground,

108

the ocean, where the many minerals contained within acted as a catalyst for life as we know it today.

109

So, in the end, it looks like we did lose a billion years of history down the back of the sofa, only the sofa in question turns out to be the bottom of the ocean.

110

But Snowball Earth remains a theory, one that was only posed as recently as 1998 by Dr Paul Hoffman, And, if you ask me,

111

two decades doesn't seem like enough time to definitively explain a billion years of missing history.

112

Maybe someday new techniques or technologies will rock the geology world

113

and enable us to fill in more of the missing gaps in our planet's very long, very empty history book.

114

But, until then, the great unconformity will remain a great mystery.

앱 다운로드

유창하게 말하는 데 필요한 모든 것

AI 발음 평가문장마다 점수 확인

IPA 발음 연습모든 소리 마스터

단어 학습나만의 단어장 만들기

단어 게임놀면서 외우기

QR 스캔

Download on theApp Store Get it onGoogle Play

FOR YOU

이 비디오로 영어 말하기 연습하면 좋은 이유

이 비디오는 지구 역사에 관한 흥미로운 이야기를 자연스러운 톤으로 전달하기 때문에 shadowspeak이나 영어 쉐도잉 연습에 최적입니다. 과학적 용어와 일상적인 표현이 섞여 있어 실제 의사소통에서 필요한 다양한 어휘와 문장 구조를 익힐 수 있습니다. 특히 IELTS 스피킹 준비생들에게는 논리적 설명과 예시를 연결하는 방법을 배울 수 있는 기회입니다. 비디오의 흥미로운 주제는 집중력을 높여주어 쉐도잉 연습을 더 재미있게 만들어줍니다.

문맥 속 문법과 표현

"If you’ve ever found yourself flipping furniture..." - "find oneself ~ing" 구조는 "눈치채지 못한 사이에 ~하고 있다"는 뜻으로, 일상적 상황을 생생하게 표현할 때 유용합니다. 쉐도잉할 때 이 구조의 리듬을 따라하면 자연스러운 말하기가 가능해집니다.
"Not exactly rock-et science..." - "rocket science"는 "어려운 일"이라는 의미의 관용구입니다. "Not exactly ~"와 결합해 "별로 어렵지는 않다"는 뉘앙스를 전달하며, 농담스러운 톤에서 자주 사용됩니다.
"it’s like hitting pause, rewind and then record again..." - "it's like ~"는 비유를 할 때 자주 사용되는 표현으로, 복잡한 개념을 쉽게 설명할 때 유용합니다. shadow speech 연습에서 이 표현을 사용하면 설명 능력이 향상됩니다.

발음의 함정

비디오에서 주의해야 할 발음이 몇 가지 있습니다. "Unconformity"는 [ˌʌnkənˈfɔːrməti]로 발음하며, 중간의 "con" 부분이 약하게 발음되어 "un-kən-FOR-mə-tee"로 들릴 수 있습니다. "Stratigraphy"는 [strəˈtɪɡrəfi]로, "str"과 "t"의 연속 발음이 어렵습니다. 또한 "sedimentary"는 [ˌsedɪˈmentri]로, 마지막 "ary" 부분을 [tri]가 아닌 [tri]로 발음해야 합니다. shadowing site에서 이 단어들을 반복 연습하면 발음 정확도가 높아집니다.

이 영상의 문법

화자가 가장 많이 쓰는 문형을 영상 속 실제 표현과 함께 정리했습니다.

문형	영상 속 표현
수동태 be + 과거분사 — 누가 하는지보다 무슨 일이 일어나는지에 초점	being littered · is formed · is frozen
현재완료 have/has + 과거분사 — 과거의 일이 지금도 관련이 있을 때	you've ever found · has come · it's been
관계절 who / which + 절 — 사람이나 사물에 대한 추가 정보	Laurentia, which is · one that was

쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법

쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.

섀도잉 방법: 단계별 전체 가이드 읽기 →

쉐도잉 연습: There's a Giant Hole In Earth's History - 영상으로 영어 말하기 배우기

연습 모드 선택

앱 다운로드

추천 영상

Spending a Day on Earth 200 Million Years Ago

How Were the Pyramids Actually Built?

I Flipped 100 Rocks on the Ocean Floor, Here's What I Found... (Sea Monsters?)

Why do People Get Stuck in Caves?

[Unit 6.2] The Fossil Hunters - 4000 Essential English Words

How the Grand Canyon Was Really Carved?

Why are coral reefs so important?

What Did Ancient Humans Actually Do All Day?

Ricky Gervais Explains The BIG Problem With Noah's Ark | Out Of England

The Most Expensive MISTAKES Ever

The Heaviest Part of a Forest Is NOT What You Think

5 Minutes of Random Earth Facts

이 비디오로 영어 말하기 연습하면 좋은 이유

문맥 속 문법과 표현

발음의 함정

이 영상의 문법

쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법