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How old is the earth?
4.5 billion years old
What was the earth like in its earliest form?
ball of molten rock
How did the earth become a "water world"?
from water rich meteors
What is the oldest type of rock on Earth and how were they formed?
pillo lava (basaltic lava); formed when lava is submerged in deep water
How were the Earth's continents formed and by which type of rock?
formed by superheated water and lava; type of rock = granite
What was the name of the Earth's first SuperContinent?
How did this planet become "snowball earth"?
the supercontinent Rodinia blocked hot water flows causing the planet to freeze
What are Sromatolites and what did they do?
they are the earliest living thing on Earth; they produced oxygen
What causes the continents to drift?
convection currents; circulation of magma in the mantle; Alfred Wegner
What happened during the Cambrian Explosion?
An increase in the number and complexity of life forms on Earth
What happened to allow life forms to leave the oceans?
the ozone layer was created blocking the UV radiation from destroying life that tried to leave the ocean
What was Pangaea?
the most recent super continent
What happened to the dinosaurs (specifically)?
they were hit by an enormous meteor; volcanoes finished them off
Which two primary forces created the Grand Canyon and all mountains?
continental drift and erosion
Which animal have dominated the Earth since the end of the dinosaurs?
9th Grade Geography Video Quiz