Unit Three Test 6th
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (24 张)
● What is the theory of continental drift?
That continent were once together and slowly drifted apart
What is the name given to the giant continent that was once on Earth’s surface?
Pangea
What is the part of the Earth that tectonic plates move on?
Asthenosphere
● What are the pieces of the lithosphere that move around on top of the asthenosphere?
Tectonic Plates
● How did the continents drift apart?
Convection currents, tectonic plates continental drift and they just drifted
What do most scientists believe causes Earth’s plates to move?
Convection currents
What fills the gap as the seafloor spreads?
magma
What is subduction?
When one plate slips under another
Describe a divergent plate boundary and tell when it occurs.
It happens when plates move away from one another
Describe a convergent plate boundary and tell when it occurs.
When plates collide together
Describe a transform boundary and tell when it occurs.
Two plates slide past each other and plates move opposite directions
How does tension affect rock?
Pulls on rock making the middle thinner and weaker
How does compression affect rock?
Squeezes rocks until it breaks
How does shearing affect rock?
Pushes rock in opposite direction
What does stress add to the rock?
Adds energy to the rock which changes its shape or volume
What type of stress produces reverse faults?
Compression
What type of stress produces normal faults?
Tension
What type of stress produces strike slip faults?
Shearing
Describe a normal fault.
Plates are pulled apart at divergent plates boundaries
Describe a reverse fault.
Plates are being pulled apart at convection plate boundaries
Describe a strike slip fault.
Plates slide past each other at the transform boundary
Be able to label each type of fault.
Normal faults occur when two plates, one on top of the other, slide past each other and create the fault. Reverse faults occur when one plate slides under the other, creating a vertical offset. Strike-slip faults happen when two plates move horizontally past each other
● In a normal fault, the part of the fault that lies below the other part is called the ____ ____
Foot wall
Describe P waves and how they move.
1st to arrive travels through solid and liquid carries energy away from focus through interior