Erosion
What 2 factors erode Rocks?
1)wave energy
2) rock hardness
What is Deposition?
Is the process by which eroded material is dropped.
What landforms can streams create?
A stream forms as water erodes soil and rock to make a channel.
What is physical weathering?
The process by which rock is broken down into smaller pieces by physical changes.
What is chemical weathering?
Is the breakdown of rocks by chemical reactions.
if a large rock has constantly flowing water on top of it what would happen to the rock?
the flowing water would cut through the rock forming steep canyons and valley.
When does deposition occur?
When gravity’s downward pull on sediment is greater than the flowing water or wind.
What landforms are made by ground water erosion?
caves.
What is physical weathering pressure?
Rocks formed Deep in crust come up to surface, less pressure causes rock to expand & crack= Exfoliation.
What is Chemical weathering R. with oxygen?
Rocks react with Oxygen & change colors= oxidation ox in Air & water iron turns to rust.
If a roof of a cave collapsed what does it leave behind?
A circular depression called a sinkhole
What happens to floodplains by Deposition?
Many layers of deposited sediment can form a flat area called a floodplain.
What coastal landforms are made by erosion?
As a result, part of the shoreline is carved out and forms a bay.
What is physical weathering temperature?
Rocks expand when hot & contract when cold causing it to crack p. Ice weding process where water gets in cracks, Freezes & expand crack.
What is Chemical weathering acid rain?
Acid in air from pollution & fossil fuel burning combine with Rain forming Acid rain. The acid rain falls on rocks, Breaking them down.
How do caves form?
Ground water between rocks erode and dissolves rock forming caves.
What happens to Deltas and Alluvial fans by Deposition?
When a stream empties into a body of water, such as a lake or an ocean, it’s current slows and it deposits its load. Streams often deposit their loads in a fan shaped pattern called a delta.
What coastal landforms are made by deposition?
Beaches, sandbars and barrier islands.
What physical weathering Animal Actions?
Animals dig & push rock to surface allow for more weathering.
Chemical weathering Acid in groundwater?
Acid in g.w. gets into rocks cracks, after millions of years can from caves, water dissolves Minerals & later deposits them as stalacties & stalagmiles.
What waves cause little erosion and What waves cause a lot of erosion?
Gentle waves, cause little erosion
strong waves, from heavy storm increase the rate of erosion.
What can form different landforms?
A stream deposits materials along its bed, bapinks, and mouth.
What was flat six million years ago?
The grand canyon.
What physical weathering wind, water, gravity?
Abrasion rock breaking rock happens when water tumbles rock. Wind carries sand. Gravity pulled down rocks.
Chemical weathering acid in livings things?
Lichen & moss grow on rock releasing a little acid breaking down rock. Other living things produre acid that can cause rock to break.