Plate Tectonics

Question 1

Which layer do humans live on?

Answer 1

Lithosphere

Question 2

What do the under-the-crust asthenosphere flows determine?

Answer 2

Which direction each plate moves

Question 3

What is the mantle?

Answer 3

Slowly flowing combination of liquid and solid rock

Question 4

What have geologists hypothesizes about the movement of tectonic plates?

Answer 4

It’s related to convection currents in the earth’s mantle *asthenosphere

Question 5

Which crust is less dense?

Answer 5

Continental crust

Question 6

Continental plates are lighter than oceanic plates b/c of the type of rock that makes each (granite is less dense than basalt)

Question 7

Relative motion of tectonic plates at bounderies determines the boundary types

Question 8

What are the three types of plate boundaries

Answer 8

Divergent, convergent, and transform boundaries

Question 9

Divergent

Answer 9

Plates move away
Earthquakes and volcanoes occur

Question 10

Convergent

Answer 10

Plates move towards one another
When 2 plates collide, dense plates slides under less dense plate

Question 11

Transform?

Answer 11

Plates slide

Question 12

What are the two types of crusts?

Answer 12

Plates may be oceanic or continental crust

Question 13

What is formed by divergent boundary in continental crust?

Question 14

What is “Sea-floor spreading”

Answer 14

Two plates move away from each other

Question 15

What is formed by “Sea-floor spreading”

Answer 15

Mid ocean ridges form

Question 16

What is a volcano?

Answer 16

Vent in the surface of earth that emits ash, has, and molten lava

Question 17

Why is the continental crust less dense?

Answer 17

Due to chemical composition of rock

Question 18

What type of rock is the oceanic crust?

Answer 18

Basalt

Question 19

What is the oceanic crust?

Answer 19

Older oceanic crust is more dense than younger oceanic crust

Question 20

Where are volcanoes common along?

Answer 20

Subduction zones