Science Plate Tectonics

Question 0

Rocks found on different continents

Answer 0

There are rock fields that line up when you piece the continents together (coal field in North America, Europe, and Northwest Africa)

Question 1

Continents fit

Answer 1

The continents fit together, supporting the fact that they separated from one big continent.

Question 2

Similar Mountain Chains Across Continents

Answer 2

Mountain chains that line up when continents are pieced together (a chain across South America and South Africa)

Question 3

Fossil evidence

Answer 3

Variety of fossils found across the continents that couldn’t have crossed oceans (glossopteris and mesosaurus)

Question 4

Climate Evidence

Answer 4

Similar glacier marks in different continents that match up, and organisms found on continents they could not live on now.

Question 5

Three Pieces of Evidence for Sea Floor Spreading

Answer 5

Pillow Rocks- made by magma cooling quickly after erupting

Age of Crust- mid-ocean ridge crust newer, and ocean crust is newer that continental crust

Magnetic Stripes in ocean crust- iron in magma frozen to face magnetic north

Question 6

Oceanic Oceanic Convergent

Answer 6

The older and denser crust subducts, which can result in volcanic island arcs as crust melts and magma rises, trenches, earthquakes

Question 7

Oceanic Oceanic Divergent

Answer 7

Two plates move apart in opposite directions, a rift valley forms at the fault between the plates, where magma rises that forms new ocean floor and pushes the older crust to the side casing ridges

Question 8

Oceanic Continental Convergent

Answer 8

Thinner, denser ocean crust sinks under the thicker, less dense continental crust (this is subduction). The oceanic crust melts back into the mantle. At the fault, a deep ocean trench forms. On the continental crust, mountains form.

Question 9

Continental Continental Convergent

Answer 9

Two continental plates collide. Because of the thickness of the plates, neither subducts and both are forced upwards to form mountains.

Question 10

Continental Continental Divergent

Answer 10

Two continental plates separate, or move away from each other. A rift valley forms at the fault between the plates. New ocean basins CAN form this way.

Question 11

Give 2 names for a Transform Boundary

Answer 11

Conservative Boundary and Strike-slip

Question 12

Transform Boundary

Answer 12

Two plates are sliding past each other, either in the same direction or opposite directions. This is often the site of many earthquakes.

Question 13

Sea floor spreading occurs on what boundaries?

Answer 13

Divergent

Question 14

What are the deepest parts of the ocean?

Answer 14

Trenches

Question 15

Name the supercontinent that separated to form all the modern continents

Answer 15

Pangaea

Question 16

Who proposed the continental drift theory

Answer 16

Alfred Wegener

Question 17

Who proposed the theory of sea-floor spreading

Answer 17

Harry Hess

Question 18

At what type of boundary would magnetic stripes in the crust be found?

Answer 18

Divergent

Question 19

At what type of boundary is a trench located?

Answer 19

Convergent

Question 20

At what type of boundary is subduction occurring?

Answer 20

Convergent

Question 21

At what type of boundary will mid-ocean ridges tend to form?

Answer 21

Divergent

Question 22

If oceanic crust and continental crust come together, which crust sinks
under? Why?

Answer 22

Oceanic, because it is more dense.

Question 23

If 2 continental crusts slide past each other, what type of an effect can
we expect?

Answer 23

Earthquakes

Question 24

Where can we find a transform fault in the US?

Answer 24

San Andreas Fault in California