6th Grade Science MIDTERM: Chapter 2 Flashcards
mechanical or chemical weathering
abrasion
mechanical weathering
mechanical or chemical weathering
frost heaving
mechanical weathering
mechanical or chemical weathering
acid rain
chemical weathering
mechanical or chemical weathering
oxidation
chemical weathering
mechanical or chemical weathering
lichens
chemical weathering
mechanical or chemical weathering
exfoliation
mechanical weathering
mechanical or chemical weathering
pressure release
mechanical weathering
mechanical or chemical weathering
carbon acid
chemical weathering
the amount of each kind of particle in a soil sample
texture
layers of soil
horizons
small particles of weathered rocks and minerals
sediment
decayed organic material found in soil
humus
the largest kind of particle in soil
sand
the dropping of sediment and rocks in a new location
deposition
the sediment that a stream carries
load
a pile of rocks and soil deposited by a glacier
moraine
an area of sediment deposited at the mouth of a river
delta
the process of rock changing from one type to another is called _____.
the rock cycle
the process of breaking down rocks is called ____.
weathering
____ changes rocks into new substances.
chemical weathering
_____ occurs whenever rocks rub against each other.
abrasion
unweathered rock that influences the soil above it called _____.
bedrock
_____ contains weathered minerals and some nutrients from the humus
subsoil
A fertile soil that has equal parts of sand and silt communes with about half as much clay is called _____
loam
the primary force behind erosion is _______
gravity
A ______ forms when unmelted snow gets compacted down into ice.
glacier
A ____ is an example of erosion that is caused by gravity.
rockslide
What is the difference between weathering and erosion?
Weathering is the breaking down of rocks, and erosion is the moving of weathered material from one place to another.
What causes depositions to have a layered look?
Sediment settles according to its weight. The heaviest sediment drops first, and the lightest sediments drops last, forming layers.
Micah and Joshua like to play by a stream that runs through their grandpa’s field. The stream was wide and shallow, but the boys dug out a new path that is much narrower than the old path. How will the new path change the erosion of the stream?
The narrower streamed would cause the water to flow faster. Erosion would be greater as the water load moved faster. Because there would be less sediment deposition, the streamed would probably deepen.
The Grant Memorial in Washington, DC consists of bronze statues on white marble bases. Something has caused some of the bronze to dissolve and thus discolor the marble. Describe what may have caused the weathering of the bronze statues.
Acid rain may have caused the weathering. Smoke, exhaust, and pollution in the air combine to form acid rain. The acid in the rain would cause the bronze to dissolve and run down to stain the marble.
