Geology Flashcards
Draw the rock cycle?
https://sketch.io/sketchpad/
https://docs.google.com/document/d/1wQwsh0jvlz9V_7dtWkDSCquw1iepJmlwdV7VfTTwsgo/edit
What is a rock cycle?
A model that shows the endless cycling of materials that make up rocks, by processes that occur within the Earth and on its surface.
What is weathering?
Rock is broken down into smaller pieces.
What is erosion?
The broken rock material is transported from one place to another.
Difference between weathering and erosion.
Weathering is the process of breaking rocks down into small particles, while erosion is the process of moving those particles elsewhere.
What are the agents (cause) of erosion?
water, wind, gravity or ice.
What are the factors of weathering?
Physical weathering, Biological weathering & Chemical weathering.
What causes Physical weathering?
Action of wind, temperature change, water & ice.
What causes Biological weathering?
When living things (plants) breakdown the rock
What causes Chemical weathering?
When water dissolving chemical from the soil and air react with rock, breaking it down.
How does the cooling rate affects the sizes of crystals?
Rocks that cools faster has smaller crystals, rocks that cools slower has larger crystals.
Formation of sedimentary rocks.
1) Sediments are laid down by ice, wind or water, in horizontal layers called beds.
2) Within each bed the sediment grains are squashed together so that they are in close contact.
3) Water seeps in between the grains, bringing many dissolved chemicals.
4) When the water evaporates, these chemicals are left behind as crystals around the edges of the grains. These crystals cement the grains of sediment together to form rock.
What are fossils?
Evidence of living things preserved in rocks
How do fossils form?
Through imprints of an organism
Where are fossils found in?
Sedimentary rocks (Sandstone, mudstone, siltstone, limestone and coal)
