1
A solid object that forms crystals?
mineral
How many, and what are the layers of the Earth?
three
crust, mantel, and core
What is melted rock called?
magma
Weathering breaks down rocks into pieces, these pieces of broken rock are called sediment. What do these layers become?
sedimentary rocks
Rocks that have cooled and hardened from melted rock are called?
igneous rocks
What are traces of the remains of the living things that died a long time ago?
fossils
The crust (outer layer) is broken into huge, thick pieces called?
plates
What is the theory that explains the motion of the plates?
Plate tectonics
What is it called where two plates meet?
Plate boundaries
What is a volcano filled with?
melted rock called magma
What is divergent mean?
to move apart
what does convergent mean?
to move together
Moving plates can cause what?
earthquakes
Earthquakes usually happen near cracks in the crust called what?
faults
Most volcanoes and earthquakes happen near what?
plate boundaries
What is the Ring of Fire?
along the edges of the Pacific Ocean, where many plate boundaries are. Almost all of the world's earthquakes happen there?
What can form where volcanoes erupt?
mountains
What forms when heat and pressure change existing rocks into different rocks?
metamorphic rocks
What are low areas of land between mountains or hills?
valleys
What are large, flat areas of land?
plains
What are high areas of land with flat tops and steep sides?
plataues
What is the process in which rocks are slowly broken into smaller pieces?
weathering
What is the process that moves rock and soil from one place to another?
erosion
Pieces of broken rock are called?
sediment
What forms when rivers wear away rock?
canyons