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18 terms

7th grade Geography chpt 1 sect. 3

STUDY
PLAY
How many layers does the earth have?
3
What are the names of the layers of the earth?
1. Crust 2. Mantle 3. Core
Core
center of the earth formed of hot iron mixed with other materials
Mantle
the layer of hot, solid material between Earth's crust and core
Magma
hot melted rock that sometimes flows to the earth's surface during a volcanic eruption
Crust
uppermost layer of the earth
Continents
massive land areas (7)
Plate Tectonics theory
theory that earth's crust is not an unbroken shell but consists of plates or huge slabs of rock that move.
Pangea
the super continent where all the continents were once joined
Continental drift
the gradual movement and formation of continents (as described by plate tectonics)
Earthquake
violent and sudden movement of the earth's crust
Tsunami
a huge destructive wave caused by an earthquake on the ocean floor
Faults
cracks in the earth's crust
Weathering
the process of breaking surface rock into boulders, gravel, sand and soil
What things cause weathering?
water, frost, chemicals, plants, ice
Erosion
the process of wearing away or moving weathered material.
What are the three greatest factors that erode or wear away surface material?
Water, wind, ice
Glaciers
huge, slow moving sheets of ice