Earth Layers
What is the top, least dense layer of Earth?
Crust
Who proposed the theory of continental drift?
Alfred Wegener
What is the study of the formation and movement of the plates called?
Plate Tectonics
What kind are the 3 types of plate boundaries?
Divergent, Convergent, Transform
What is a hot spot?
Area where magma rises in the middle of a plate and produces volcanoes
What is the bottom most dense layer of Earth?
Inner Core
What was the name of the supercontinent that existed 225 million years ago?
Pangea
What are the 2 types of crust?
Oceanic and Continental
What type of convergent boundary will produce plain mountains on land?
Continental to continental convergent
Who discovered seafloor spreading and The Mid-Atlantic Ridge?
Harry Hess
What layer is divided into the lithosphere and asthenosphere?
Mantle
What did the puzzle like fit of the continents show?
Evidence for continental drift
What type of crust is made mostly of basalt and is more dense that the other?
Oceanic
What type of plate boundary formed Japan and the Marianas Trench?
Oceanic to Oceanic Convergent
What evidence did magentic reversals on the seafloor indicate?
Evidence for continental drift
What layer is also known as the plates?
Lithosphere
What was found in Antartica that showed that it was once closer to the equator?
Fern fossil
What layer is resposible for the plate(lithosphere) movement?
Asthenosphere
What type of plate boundary will produce seafloor spreading and mid-ocean ridges such as The Midatlantic Ridge?
Divergent Boundaries
What type of plate boundary formed Mt. St. Helens?
Oceanic to Continental Convergent
What is happening in the asthensopshere that causes the plates to move?
Convection Currents
Where do most earthquakes and volcanoes occur?
Along plate boundaries
In a convection current, what temperature magma rises to the top b/c it is less dense?
Hot or warmer
What type of plate boundary produces trenches in the ocean and volcanic mountains on land?
Oceanic to Continental Convergent
What 2 features formed as a result of hotspots?
Hawaii and Yellowstone