How The Earth Was Formed
“How the Earth was Formed” video notes:
Theory:
-sun was surrounded by a cloud of dust and gas
-as cloud cooled little grains of minerals started forming
-grains of minerals started bumping into each other
(Problem was nobody could explain how these microscopic minerals formed a planet)
Then in 2003 astronaut Don Pettit performed an experiment onboard the international space station. He put some salt in a plastic bag and found that almost immediately the grains started gathering together into little clumps held together by static charge.
-These mineral grains grew into small pieces of rock orbiting the sun
-over the next few million years some of these rocks collided and grew bigger
-when a rock grew to become around half a mile across, its gravitational pull became strong enough to pull objects towards it. (The bigger the rock was the faster it grew because it had higher gravitational pull)
-so that biggest rock eventually grew to become ‘the fledgling earth’
-soon this small planet grew to attract even bigger objects that collided with its surface, every impact only served to increase its size.
-The collisions were so intense it only (lol) took about 30 million years for the planet to grow to (approximately) its present size.
Presently, the earth is separated into three layers: A thin crust, then a massive dense layer of rock called the mantle, and an iron and nickel core.
-So then this big rock became so hot that it melted and the denser materials drifted to the core while the lighter materials floated at the top
-the heating up of fledgling earth could have been due to the incorporation of very hot radioactive elements.
-The temperature of molten earth was now 2000 degrees, but at the edge of the planet the temperature of space was a constant -450 degrees, almost 2 ½ thousand degrees colder.
-So because of this the surface could not stay molten forever
-then in about a million years the earth had its thin crust, but volcanoes still erupted and meteorites
Theory:
-sun was surrounded by a cloud of dust and gas
-as cloud cooled little grains of minerals started forming
-grains of minerals started bumping into each other
(Problem was nobody could explain how these microscopic minerals formed a planet)
Then in 2003 astronaut Don Pettit performed an experiment onboard the international space station. He put some salt in a plastic bag and found that almost immediately the grains started gathering together into little clumps held together by static charge.
-These mineral grains grew into small pieces of rock orbiting the sun
-over the next few million years some of these rocks collided and grew bigger
-when a rock grew to become around half a mile across, its gravitational pull became strong enough to pull objects towards it. (The bigger the rock was the faster it grew because it had higher gravitational pull)
-so that biggest rock eventually grew to become ‘the fledgling earth’
-soon this small planet grew to attract even bigger objects that collided with its surface, every impact only served to increase its size.
-The collisions were so intense it only (lol) took about 30 million years for the planet to grow to (approximately) its present size.
Presently, the earth is separated into three layers: A thin crust, then a massive dense layer of rock called the mantle, and an iron and nickel core.
-So then this big rock became so hot that it melted and the denser materials drifted to the core while the lighter materials floated at the top
-the heating up of fledgling earth could have been due to the incorporation of very hot radioactive elements.
-The temperature of molten earth was now 2000 degrees, but at the edge of the planet the temperature of space was a constant -450 degrees, almost 2 ½ thousand degrees colder.
-So because of this the surface could not stay molten forever
-then in about a million years the earth had its thin crust, but volcanoes still erupted and meteorites