Rock Cycle
What's a Igneous rock?
Crystalline solids that are formed from the cooling of magma. The Earth is made of igneous rocks where our planet is exposed to the coldness of space.
Weathering is the breaking down of rock into ___________.
Sediment
Rain washing away soil from a hillside
Erosion.
Earthquakes typically occur ______.
Along plate boundaries
What two elements is the core made of?
Iron and nickel
What are Metamorphic rocks?
Metamorphic rocks are rocks that have become changed by intense heat or pressure while forming.
Weathering, erosion, and deposition occur over many
a. days
b. years
c. months
Years
The fertile, upper part of the soil
topsoil.
What would you be most likely to find at a transform boundary?
Earthquakes.
What is the thinnest layer of the earth’s composition?
Crust
How are sedimentary rocks formed?
Made by physical processes, by plants and animals, and by chemical processes.
The dropping off of sediments in a new place is called __________.
Deposition
Plants prevent soil erosion by-
Holding dirt in place with their roots
What is the term for a heavier, denser plate sliding under a less dense plate?
Subduction
What is the thickest layer of the earth?
Mantle.
How are Igneous rocks formed?
Form from magma cooling.
What is erosion?
Erosion is the movement of sediment from one place to another.
The very top layer of soil is mostly made of
Mostly organic material (humus)
What are the 3 main types of plate boundaries?
Divergent, convergent, transform
What are large pieces of lithosphere that move around on the asthenosphere called?
Tectonic plates
How are Metamorphic rocks formed?
Rocks formed by extreme heat, pressure, or chemically active fluids.
What is sediment?
Bits of rock, sand, and silt caused by the weathering of rocks
Decayed organic material in soil is called______.
Humus.
At what type of plate boundary does subduction occur?
Subduction is a geological process that takes place at convergent boundaries of tectonic plates.
What is the plastic, semi-solid layer that contains a convection current that moves the plates called?
Inner core.