W.E.D. 1
This is the movement of sediment.
What is erosion?
When sediments are dropped in a new place.
What is deposition?
A crack in the sidewalk is an example of this process.
What is weathering?
Rock changed by heat and pressure.
What is metamorphic rock?
Rock formed from layers of sediment pressed together.
What is sedimentary rock?
This is the breaking down of rocks into smaller pieces.
What is weathering?
Name at least two forces that can cause erosion.
Water, wind, ice, or gravity (any two).
Rust on swing chains is caused by this type of weathering.
What is chemical weathering?
Rock formed from melted rocks cooling quickly outside Earth.
What is extrusive igneous rocks?
Rock formed from melted rocks cooling and hardening inside Earth.
What is intrusive ignerous rock?
Rust on a tetherball pole is this type of weathering.
What is chemical weathering?
This type of weathering breaks rocks without changing what they are made of.
What is physical weathering?
A sunken hole in asphalt likely formed because soil underneath moved. This process is called:
What is erosion caused by gravity?
Name the two processes that turn sediment into sedimentary rock.
What are compaction and cementation?
This type of rock often has layers and are soft and crumbly. It can sometimes contain fossils.
What is sedimentary rocks?
The chemical reaction that causes rust is called this.
What is oxidation?
Explain how plants help prevent erosion.
Roots hold soil in place and reduce movement by water or wind.
The hole under the portable may have formed because soil was moved by animals or water. This is:
What is erosion?
This type of rock often has little to no crystals, often filled with holes, or has a shiny glassy look.
What is extrusive igneous rocks? (ex: Basalt, Obsidian)
This type of rock is often dense, shiny, and usually very hard, some with layers or bands.
What is metamorphic rocks?
Explain why rust is NOT erosion.
(What is it an example of, and WHY is it not an example of erosion?)
Rust is chemical weathering because it changes the metal chemically. Erosion means movement, and rust does not move the metal.
What are the three types of chemical weathering mentioned in the video we watched during class?
What are oxidation, carbonation, hydration?
Explain how plants can BOTH prevent erosion and cause weathering.
Roots hold soil to prevent erosion, but roots can also grow into cracks and break rocks apart causing weathering.
This type of rock has coarse or large grained crystals visible to our eyes that takes thousands to million years to harden.
What is intrusive igneous rocks?
Can sediments turn directly into igneous rock? Explain why or why not using key vocabulary words.
No. Sediments must become sedimentary rocks through compaction and cementation. Then it would need to melt into magma to cool and harden in order to become an igneous rock.