Chapter 7.1 Digital Lesson

Question 1

What happened to the temperatures around the world because of the gas and ash in the atmosphere because of a volcano

Answer 1

Temperatures around the world dropped

Question 2

What was wegners hypothesis about continental drift

Answer 2

He thought the continents drifted to their current location

Question 3

Who thought the continents looked like they could fit together like a puzzle piece

Answer 3

Ortelius

Question 4

What did Wegener call the supercontinent

Answer 4

Pangea

Question 5

4 pieces of evidence for continental drift

Answer 5

1. Matching coastlines
2. Similar rock layers
3. Similar past climates on different continents
4. Similar fossils on different continents

Question 6

Convection currents

Answer 6

Circular pattern in the asthenosphere that are caused by heat and density differences

Question 7

What are tectonic plates giant slabs of

Answer 7

Lithosphere

Question 8

What is caused by the scraping of plates

Answer 8

Earthquakes

Question 9

What is caused by the pushing of plates into each other

Answer 9

Crumbling of earths surface forming mountains and large earthquakes

Question 10

What forms when the plates move apart

Answer 10

Molten rock rises and cools forming new rock

Question 11

When scientists discovered the sea floor to be thin what did it suggest about its age

Answer 11

The sea floor was younger then what it was thought to be

Question 12

When did the volcano on the island krakatau erupt

Answer 12

August 27, 1883

Question 13

What causes mid ocean ridges

Answer 13

Volcanic eruptions

Question 14

What causes stripes on the sea floor

Answer 14

Made by magnetic reversals which is when earth’s magnetic field changes orientation at random times

Question 15

Why is the earth not expanding when it’s ocean basins continue to widen during sea floor spreading

Answer 15

Some plate is destroyed at subduction zones

Question 16

What are the two player movements that can cause volcanoes

Answer 16

When two plates pull apart or when one plate sinks beneath another plate

Question 17

How does the knowledge of tectonic plates impact society(4)

Answer 17

1. Gain scientific knowledge
2. Prepare for eruptions
3. Build earthquake resistant structures
4. Help find resources

Question 18

True of false: the observation of matching coastlines was some of the earliest evidence that contributed to the development of the theory of plate tectonics

Answer 18

True

Question 19

Continental drift contributed to the development of

Answer 19

The theory of plate tectonics

Question 20

Where does sea floor spreading occur

Answer 20

Mid ocean ridges

Question 21

Three processes that scientists think might cause tectonic plate motion

Answer 21

Continental drift, sea floor spreading, earthquakes and volcanoes