When rock layers break and move apart, this results
What is a fault?
100
A long, deep valley on the ocean floor
What is a trench?
100
an elevated flatland
What is a plateau?
200
Today ice sheets cover most of two specific areas--name one of them
What is Antarctica or Greenland?
200
The "Ring of Fire" in the Pacific Ocean is known for its frequent ________________ and volcanic activity.
What are earthquakes?
200
When the earh's crust is lifted upward by heat currents from the core, it can cause a mountain range under water. This is called a ______________ ___________.
What is a mid-ocean ridge?
200
a large, flat area on the ocean floor
What is an abyssal plain?
300
Particles of sand or mud produced by rock weathering
What is sediment?
300
The innermost layer of the earth
What is the inner core?
300
The theory that describes the earth's crust as divided into more than a dozen rigid, slow-moving plates.
What is plate tectonics?
300
Landform of level ground built by sediment deposited by a river or stream
What is a floodplain?
400
This kind of glacier is smaller and much more common than sheet glaciers.
What are mountain glaciers?
400
The thinnest layer of the earth
What is the crust?
400
This is what scientists called the "supercontinent" that they believed originally existed many millions of years ago, before plate tectonics moved the continents into their current position?
What is Pangaea?
500
Water, ice, waves, and ____________ cause erosion.
What is wind?
500
The thick layer just beneath the crust
What is the mantle?
500
Sediment deposited at the mouth of a river forms this:
What is a delta?
500
Primary landforms are created by the forces active below the earth's surface, like plate tectonics and volcanic activity. Secondary landforms, like deltas and floodplains, occur because of this process.