Unit 1 Flashcards
3 major types of boundaries
Convergent, Divergent, Transform
What geologic features are associated with convergent
Mountains, volcanoes, subduction zones
What geologic features are associated with divergent boundaries
rifts, valleys, ocean ridge
What geologic features are associated with transform
Earthquakes
Why do tectonic plates move?
Heat from the core
Evidence to support plate tectonics
Fossils, older land further out, lands used to fit together
What happens when a continental plate meets and oceanic plate
Submergent zone
When was the earth formed, how was it formed
4.6 billion years ago, it was a cloud of dust and it started to bond together
What was the beginning earth like?
it was mostly molten lava, no oxygen, no atmosphere, iron melted and in the core causing magnetic field to protect from solar
When and how was the moon formed
4.5 billion years ago, earth was hit by another planetessimal
How does the moon affect the earth
gravitational pull, causes tides
What two ways do scientists think water came to be on earth
Volcanic outgassing and ice bearing comets
What was Earth’s early atmosphere like?
It wasnt a thing
Earth’s axial tilt
caused by the collision between earth and the planetessimal when the moon was created, stabilizes earth, causes seasons
Volcanic outgassing
one way water is believed water came to be on earth.
