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Science Test Weather

First test after break

QuestionAnswer
Weathering The physical and/or chemical breakdown of rock into smaller particles called sediment
Why do rocks weather? They weather because they are adjusting to a new enviorment diffrent from the one they formed in
When does weathering take place? When rocks are exposed to water, air, falls due to gravity, and living things
Where does weathering occur? It occurs near the earths surface
What is physical weathering known as? Mechanical weathering
Physical weathering The breakdown of rocks into smaller pieces without a change in chemical composition
What are the 6 most common types of physical weathering? frost action, abrasion, plant action, exfoliation, expansion and contraction, gravity
Abrasion The grinding away of rocks by friction with other rocks. ex: sea glass
Plant Action A plant grows in a rock and the pressure makes cracks allowing it to grow
Exfoliation The peeling away of outer layers of rocks formed when a release of pressure causes the rock to crack parallel to the surface
Expansion and contraction caused by heating and cooling can cause to break rocks
Gravity As rocks weather, the broken pieces are pulled downhill
Chemical weathering the breakdown of rocks by chemical action that results in a change in the mineral composition of the rock
What are the main agents that cause chemical weathering? Oxidation, hydration, orgaicacid decay, carbonation
Oxidation Occurs when oxygen unites chemically with minerals
Hydration Occurs when water chemically combines with minerals
organic acid decay acid produced from decaying plants or animals dissolve in water and break down rock
carbonation carbon dioxide chemically combines with minerals
What does weathering rate depend on? Surface area and particle size, climate, mineral composition
Surface area and particle size The smaller the particle, the greater the weathering rate
Climate weather always occurs ore in humid climates. Cld regions have physical weathering while hot regions have chemical weathering.
Mineral composition Rocks that are harder are more resistant to weathering
Chemical weathering the breakdown of rocks by chemical action that results in a change in the mineral composition of the rock
What are the main agents that cause chemical weathering? Oxidation, hydration, orgaicacid decay, carbonation
Oxidation Occurs when oxygen unites chemically with minerals
Hydration Occurs when water chemically combines with minerals
organic acid decay acid produced from decaying plants or animals dissolve in water and break down rock
carbonation carbon dioxide chemically combines with minerals
What does weathering rate depend on? Surface area and particle size, climate, mineral composition
Surface area and particle size The smaller the particle, the greater the weathering rate
Climate weather always occurs ore in humid climates. Cld regions have physical weathering while hot regions have chemical weathering.
Mineral composition Rocks that are harder are more resistant to weathering (they weather harder)
Created by: Teddy12345