Exam 3: Earth Structure and Plate Tectonics

Surface waves are used to analyze the Earth's interior structure.

What is not a factor that separates the asthenosphere and the lower mantle into two distinct layers?

What is seafloor spreading and plate tectonics? How does seafloor spreading and plate tectonics connect previous theories of the movement of continents?

Discuss the composition and characteristics of Earth's layers. How was the composition of the mantle and core determined?

What was the first evidence that suggested the Earth's crust might be broken into pieces?

A(n) ____ is a very large column of superheated mantle that originates at the boundary of the core and mantle.

What hindered the acceptance of the continental drift theory?

The spreading ridges are almost devoid of free sediment especially compared to basins.

The Earth's core only effects S wave behavior.

Francis Bacon thought the continents were once joined together, even naming the single continent Pangaea and the surrounding ocean Panthalassa.