Roughly how long ago was the earth created?
(within 500 million years)
Roughly 5 billion years ago
100
What are the two types of tectonic plates?
Oceanic and Continental
100
What is a fault?
Cracks or fractures in the bedrock along which movement has taken place.
100
Magma becomes ---------- when it reaches the earth's surface.
Lava
200
Is crust thicker under oceans or continents?
Continents
200
What was the name of the supercontinent that existed billions of years ago?
Pangaea
200
Name two events that can occur from plate movement.
- Set off earthquakes.
- Cause magma to spew out of volcanoes
- Give rise to islands
- Push up mountains
200
This fault occurs when plates move toward one another. When they meet there is a collision that occurs in slow motion.
- Sometimes the edge of one plate sinks under the edge of another.
Convergent
200
Which of the 3 types of volcanic eruptions is the most explosive?
A- Plinian Eruption
B- Strombolian Eruption
C- Hawaiian Eruption
A- Plinian Eruption
300
Roughly, what is the total thickness of the earth?
A) 3,000 kms
B) 4,200 kms
C) 5,600 kms
D) 6,400 kms
D) 6,400 kms
300
What did Alfred Wegener's Continental Drift Theory state?
Continents float on the earth's surface and are constantly moving.
300
Roughly how quickly do plates move?
1- 1-10 centimetres/ year
2- 1-5 metres/ year
3- 10-20 metres/ year
4- 2 kilometers/ year
1-10 centimetres/ year
300
This fault occurs when plates are moving in opposite directions.
- Opens an area for magma to build up between plates.