Name: 關於地球，你不知道的15件事 (15 Things You Didn't Know About Earth)
Uploaded: 2021-01-14T05:39:05.000Z
Duration: 8 min 2 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

情態副詞

• From lakes that actually explode to a twin planet that crashed into Earth once upon

a time, we count 15 facts about the little blue planet we like to call home

15 - 24 Hours, • The common saying goes that there's only

24 hours in a day - but that isn't actually true, the Earth spins on its axis for 23 hours

and 56 minutes • The reason we add an extra 4 minutes is

because the distance in which we've orbited the sun is so great that it takes some extra

time just for us to face the sun again • And since the Earth is spinning slower

and slower every few million years, in around 250 million years a typical day will actually

last 1.5 hours longer 14 - Gravity Glitch,

• There is an area in Canada known as Hudson Bay with uneven mass - and where there's uneven

mass, there's uneven gravity • Long-since melted glaciers once lined

the area, but now they're gone and the burden of gravity remains in both the ice sheets

and underneath the Earth's crust, leading to lower gravity here than anywhere else on

Earth • Don't get too excited though - it's not

like you'll be able to start moon-jumping around Canada - the difference in gravity

is only a 0.005% reduction, so minute that you can't even feel it

13 - Photo, • 65 miles above the atmosphere, the first

ever photo of Earth was taken with a camera carried by a V-2 missile in 1946 - it snapped

a frame every second and a half and managed to survive re-entry

• The scientists who reviewed the footage were beyond ecstatic, jumping up and down

with joy that they could finally see their own world in a still image

• Likewise in 1967 the first full-on, colour Earth image was taken by the DODGE satellite,

which you can see on-screen here 12 - Ocean Salt,

• Most of the salt in our ocean comes from rocks on the shores, mainly because rainwater

which is naturally acidic breaks down the rock and distributes their components into

the water • Seawater salt is so dense that if you

were to dissolve all the oceans in the world and spread the remaining salt over all the

land on earth, you'd have a 500 foot thick salt layer coating EVERYTHING

11 - Rocks Can Walk, • There exists a flat lakebed in Death Valley

known as Racetrack Playa, in which rocks physically move from place to place

• And it's not just small rocks, but ones weighing tens or hundreds of pounds - the

theory goes that these ice-encrusted rocks are flooded by meltwater from the hills

• This makes everything nice and slick which, along with a hard breeze, allows the rock

• There is a well known theory that at the beginning of Earth's development there existed

a smaller twin planet known as Theia, roughly the size of mars

• 4.5 billion years ago it crashed into Earth and while most of it was absorbed into

Earth's crust, the rest drifted off and formed that celestial body known as the Moon

• The reason this theory came about is because typically planets of Earth's size don't have

moons quite so big, and not to mention various matters found on the Moon are somehow shared

• Many assume the Sun to be our main source of energy, a life-giving ball of energy to

which we are utterly dependent - and that if we ever stopped receiving heat from the

sun, the human race would go extinct • In reality, Earth's core is just as hot

as the surface of the Sun - between 5,000 to 7,000 degrees celcius

• In the event of a catastrophe say, sun rays are permanently blocked by clouds and

all land on Earth freezes, we can still harness the energy within Earth to keep us alive

8 - Exploding Lakes, • Three lakes in Cameroon, near the border

of the Congo named Nyos, Monoun and Kivu - more commonly referred to as the exploding lakes

• In 1984 on a small stretch of road, a gas cloud appeared and swallowed a great many

local villagers walking on their way to work before getting swept away with the wind

• 37 people were killed instantly, and they discovered the gas cloud was in fact carbon

dioxide released in an explosion from the lakes, which happened to be sitting above

volcanic Earth - and continue to do so to this day

7 - Unexplored Oceans, • Even though we've touched down on the

Moon and conquered vast mountains, the truth is we've only explored little under 10% of

the ocean • To this day we've only discovered near

210,000 underwater species with an estimated 20 million yet to be seen

• That means a distant fish-human hybrid may indeed have evolved somewhere deep beneath

the ocean surface, and mermaids could still be a real thing - either that, or more species

• Back a long time ago when dinosaurs first roamed the Earth, there existed a supercontinent

called Pangaea that merged all the countries of the world together into one landmass

• But did you know that another supercontinent will form in the next 250 million years?

• It's name will be Pangaea Ultima, including a subduction of the western Atlantic, the

destruction of the Atlantic and Indian basin, rejoining America with Africa and Europe - the

centre of this giant landmass effectively a semi-arad desert prone to extreme temperatures

5 - Leaving a Mark, • Nuclear tests in the 1950s continuing

to this day have thrown dust into the atmosphere circling our planet - most of it falls down

as rain and snow, but some gets trapped in glaciers

• These glaciers formed over millions of years leave timeline indicators that help

scientists date the exact time that piece of ice formed in Earth's history

• Which means when scientists of the future look at our glacier slice, they'll no doubt

shake their heads and whisper a gentle "goddamnit" • That's IF the glaciers survive their rapid

melting from global warming - which they aren't 4 - Earth Isn't Round,

• For a long time in Earth's history, people have believed the world is flat and no doubt

you'll find people tell you this even in the comment section of this video

• But the Earth isn't exactly round either - there's a bulge inside the equator stretching

about 20 miles outwards, which actually gives it more of a rotund appearance if you look

at it from the right angle • So while it is technically circle, like

all bodies that have eaten take away one too many times, the slight gut gives it away

3 - Underwater Gold, • If you were to go exploring in the deep,

vast oceans, you might discover some flakes of gold, but did you know there are more than

20 million tons of gold at the bottom of the sea?

• The only reason we haven't grabbed our scuba gear and excavation equipment is because

the gold is spread out over such a wide area, where one litre of water contains just 13

billionths of a gram of gold that people don't think it's worth it

• There currently doesn't exist any efficient way of harvesting this gold - but if we could

manage it, we'd have enough to give every single person on earth 9 pounds worth of gold

2 - Largest Living Thing, • Most would point to the Blue Whale if

asked to identify the largest living creature on this planet, but there exists another living

organism that could easily top it • One mushroom grows fungus which tunnels

underground, one particular variety of honey mushroom found in Oregon was discovered to

be over 2,200 acres big, stretching all underground • Try to imagine yourself with body hair

spanning over 2,000 football fields and you're able to feel everything that comes into contact

with it - and you'll know what it's like to be this mushroom

1 - Super-Earths • Earth has always been a curious place

because it's only just barely far enough away from the sun not to get burnt, but not so

far that it freezes • Scientists have been searching through

a number of exoplanets, planets that orbit another star other than our sun that happen