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WHAT WAS THE YOUNG EARTH LIKE? (PART 2 (Andes formation: (contiental and…
WHAT WAS THE YOUNG EARTH LIKE?
PART 2
Alfred Wegener suggested that the continents had been connected, and he found evidence showing very similar geological strata in west Africa and Brazil. He called all continents combined, (Supercontinent), Pangea
Many geologists and scientists ignored his idea because he couldn't explain how the continents moved around Earth
Durring WW1, scientists found out that mountains (ex. Atlantic Ocean) push the Atlantic apart. This means the Atlantic is getting wider
Continental crust is the land we walk on; oceanic crust is the land beneath the oceans. Continental crust is heavier, and tends to be made of granites; Oceanic is heavier, made of boasts
Andes formation:
contiental and oceanic crust collide
oceanic dives under continental
creates friction and heat
part of continental crust melts
mountain chains up
Himalayas Formation
portions of continental crust collide
both have the same density
they crumple up to form mountain chains
Place Tectonics: fundamental idea of geology and Earth's sciences. Explains how Earth has been formed, explains how mountains were formed, why we have earthquakes and volcanoes
theory that Earth's upper crust is composted of numerous interacting plates
PART 1
If humans lived on early Earth, they wouldn't be able to live since there was no oxygen, they would be walking on molten lava, and they'd be ducking asteroids and meteorites. Also they'd be throwing up because of extreme radiation
Early Earth was so hot
for 3 main reasons
Supernova created huge amounts
of radioactive material (radioactivity
generates lots of heat)
Accretion - space debris
crashing into space debris
Pressure - as clouds got denser,
pressure increased causing heat
It's important that the inner core of Earth is metal because the metal gave the Earth its magnetic field, and the magnetic field deflects some of the sun's rays that would be harmful to living creatures such as us
Mantle consists of lighter rocks which float above the core. These rocks are so hot they're actually moving around in convection currents inside the mantle
The crust is over the mantle, and consists of very light rocks such as basalts and granites which reach the top and cool down to form the crust that we live on. The crust is pushed around by the convection currents from underneath
Earth's atmosphere formed from gassy stuff bubbles going to the top, evaporating, and very light gases such as hydrogen dispersed into space