Earth materials
how many layers does earth have?
three
how was the universe made?
the big bang theory
how fast do tectonic plates move
about 3 centimeters per year
how was the moon created?
a small planet hitting the earth and breaking material off that became the moon.
what is atoms banging into each other?
nuclear fusion
why are Moon rocks, asteroids, and meteorites valuable for learning about Earth’s formation and early history?
because they show the age and each step in the earths formation.
when was the earth made?
4.567 billion years ago
what is a protostar?
a cloud of hydrogen gas
how deep is the lower mantle?
2,200 km
what does plate tectonics affect?
everything from the movement of continents to distribution and development of species
how long did precession take?
26,000 years
Under the ocean, plates move apart and magma comes up, forming......
new ocean floor
what is the weight of each layer of the earth?
core- 31% of the earth's mass
crust- 1% of the earth's mass
mantle- 67% of the earth's mass
whats the point when the moon is closet to the earth?
perigee
What are the different types of plate tectonic boundaries?
divergent, convergent, and transform.