Fossil
How is a mold formed?
When an animal dies and its body decays and it leaves a imprint in the sediment
What are the agents of erosion?
Glaciers, water, wind, gravity.
What does weathering do?
Beraks down/dessolves rocks and other minerals
How many layers of soil are there?
3
Is creep slow or fast?
Slow
How is a cast formed?
When a mold gets filled up with minerals from sediment and ground water, and it hardens into a form of a fossil
What is the most common type of erosion?
Water erosion
What does chemical weathering do
Slowly decomposes or decays rocks and minerals
What are the horizons?
A B C
Yes
What needs to happen for a fossil to form?
When an organism falls into soft sediments such as mud and organism gets quickly buried by more sediment.
What does tilling do to farm land?
tilling farm land takes and digs up lots of the soil causing erosion
what are the two types of weathering?
Chemical and mechanical
What is the best soil horizon for planting?
horizan A
Is creep harmful?
yes
What type of rock are fossils found in?
Sedimentary rock.
What is the least severe type of erosion?
Wind erosion
What is it called when water seeps into cracks and freezes then thaws many times?
Freeze thaw weathering/ice wedging
What is it called when water seeps down from horizon A into horizon B?
leaching
How much does creep move a year
Are fossils made from the bone?
No, they are made from rock which is shaped exactly the same as the object that was originally there
Water erosion
What does mechanical weathering?
Causes rocks to fall apart
What is the worst horizon for planting?
Horizon C
What causes creep?
extended exposure to levels of stress that are below the yield strength of the material.