The Changing Earth Flashcards
What is the mantle?
A dense layer of semisolid rock about 1800 miles thick
What is the outer core?
The outer core is a sea of iron and nickel around 5000km deep
What is erosion?
Erosion is the weathering down of rocks into smaller pieces through wind or water
What is physical weathering?
Physical weathering is the break down of rocks by non-living things such as-heat,cold,ice,wind and water
What is the crust?
The thinnest layer of the earth is about 5-30 miles deep
What is chemical weathering?
Chemical weathering is the break down of rocks through chemical reactions of rocks coming into contact with water, oxygen and acids
What are minerals?
Minerals are naturally occurring solids with a chemical composition
What is a land form?
It is a natural feature of the earths surface such as valleys or mountains
What is sedimentary rock?
Sedimentary rocks are rocks that are formed by the accumulation and consolidation of mineral and organic fragments that have been deposited by water, ice or wind
What is igneous rock?
Igneous rock is a rock that is formed by solidation from a molten state.
What is metamorphic rock?
Metamorphic rock is a rock that has changed in structure or composition as a result of metamorphism
What is degradation?
The act or process of degrading
What is physical weathering?
Physical weathering is the process of braking down rocks without changing their chemical composition
What are rocks?
Rocks are minerals all combined together
What are minerals?
Minerals are made up of rocks and are a naturally occurring substance
