Rock or mineral that contains a useful material that can be mined for a profit.
What is an ore?
100
The breaking down of rocks or minerals.
What is weathering?
100
The main cause of mass movement although it is often aided by water.
What is gravity?
100
Removal of loose sediments leaving lag gravel behind.
What is deflation?
100
A river of ice moving on land.
What is glacier?
200
Bauxite. This is not mined in Virginia.
What is aluminum ore?
200
Causes feldspar to weather into clay.
What is chemical weathering?
200
Slow movement showing its action by curved tree trunks or tilted fence posts.
What is creep.
200
wind blown material that strike, scratch and break each other.
What is abrasion?
200
A bowl shaped depression caused by glacial plucking in high mountains by alpine glaciers.
What is a cirque?
300
Rare and considered beautiful minerals.
What are gems?
300
Breaking apart without changing the chemical composition.
What is mechanical weathering?
300
It leaves a curved scar called a scarp and deposits an earth flow.
What is slump?
300
Most common wind blown deposits.
What is a (barchan) sand dune.
300
Evidence that a continental glacier once covered much of the US leaving these deposits in the midwest.
What are moraines (till)?
400
Mineral used to make bricks this common substance is mined in Virginia.
What is clay (clay shale)?
400
Common form of mechanical weathering that depends of freeze thaw cycles to widen cracks in rocks.
What is ice wedging?
400
Sharpe edged material that is deposited at the base of a cliff due to rock slide or fall.
What is talus?
400
Fine soil deposited by sediments blown from deserts or dried glacial lake beds.
What is loess?
400
A freezing and pulling process by which glaciers erode.
What is plucking?
500
Most commonly mined resource in Virginia, it is used to build roads and buildings. Also called crushed stone.
What is aggregates?
500
A product of weathering composed of mineral fragments, organic material, air and water.
What is soil?
500
Rapid mass movement consisting of rocks, soil, organics and water results in steeper valleys and a fan shaped deposit. A danger in the mountainous areas of Virginia.
What is debris flow?
500
Saltation and abrasion causes dunes to move in the leeward direction (away from the wind).
What is dune migration?
500
Evidence that glacial like weather extended into Virginia even though the glaciers did not.