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16 terms

Changes to the Earth Words 125 - 140

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Agent of erosion and weathering
wind, water, ice, and waves are the forces that cause weathering and erosion
weathering
The breaking up of earth materials into smaller pieces and wearing away of rock.
Erosion
The movement of weathered sediments by water, wind, or ice.
Deposition
The process where sediment eroded by wind, water, or ice is dropped in a new place.
Delta
soil which is deposited at the mouth of a river, usually in a triangular shape.
Canyon
a valley between steep cliff sides formed by running water, such as a river or stream
Sand Dune
a hill of sand created by the wind
Striation
Grooves of scratches found in surface rock that are the result of glacial abrasion
Glacier
A large mass of slowly moving ice and snow that carves new features and deposits sediments
Landform
A natural geographic structure on Earth's surface.
Fossil
Evidence of ancient past life, such as petrified wood, dinosaur
Paleontology
a scientist (paleontologist) who studies ancient life using fossils
MYA
Million of Years Ago
Prehistoric
before recorded history
Extinction
death of an entire species.
Mass Extinction
Extinction on a large scale, such as the extinction of the dinosaurs.