The earth formed from...
a piece of mars that broke off
the sun exploding
gas and dust coming together due to gravity.
an alien spacecraft
The early atmosphere was missing...
carbon dioxide
methane
water vapor
oxygen
Which of the following correctly describes formation of the layers of rock on earth?
silica sunk to the center, lighter materials like iron make up the crust
iron sunk to the center, lighter materials like silica make up the crust
hydrogen sunk to the center, lighter materials like iron make up the crust
iron sunk to the center, lighter materials like nickel and uranium make up the crust
There are multiple theories on how the oceans form. Which of the following are theories that are still being considered? Pick all that are correct
comets hit earth over millions of years bring water and forming oceans
a meteorite storm brought water inside of rocks that made it to the atmosphere and rained down to form oceans
at the beginning water vapor escaped from cooling molten rock, condensed and fell as rain for millions of years. This forms oceans.
the planet thea was covered in water and during the collision with the earth, it released its water to the earth.
The continents began shifting because of....
meteorite bombardments
the movement of the oceans
heat trapped beneath the earth's crust
the magnetic field
Banded(rusted) iron deposits are evidence that _______ is being produced by bacteria
The first supercontinent is called
pangea
laurasia
rodinia
cambria
Which of the following had to be in place before life could move to land?
continents
the ozone layer
b and c
The earth is around _________ years old
4.5 billion
10 billion
3 billion
100 million
The EON that the earth formed in is called the ....
Paleozoic
Cambrian Period
Precambrian
Mesozoic
The moon was formed from...
the moon is a piece of the asteroid belt that drifting into earth's orbit
gas and dust coming together at the formation of the solar system
planet Thea collides with earth, the surface of earth is blasted off and forms the moon
the moon used to be a part of Jupiter's system but was pulled into the earth's gravity.
We have a magnetic field because
the iron core of the earth spins inside out the outer, this spinning iron ball produces a magnetic field
the minerals in the oceans create an electric field
the earth spins, and the coriolis effect produces a magnetic field
everytime we are hit by an iron meteorite our magnetic field grows stronger
