7th grade Geography chpt 1 sect. 3
How many layers does the earth have?
What are the names of the layers of the earth?
1. Crust 2. Mantle 3. Core
center of the earth formed of hot iron mixed with other materials
the layer of hot, solid material between Earth's crust and core
hot melted rock that sometimes flows to the earth's surface during a volcanic eruption
uppermost layer of the earth
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.
the super continent where all the continents were once joined
the gradual movement and formation of continents (as described by plate tectonics)
violent and sudden movement of the earth's crust
a huge destructive wave caused by an earthquake on the ocean floor
cracks in the earth's crust
the process of breaking surface rock into boulders, gravel, sand and soil
What things cause weathering?
water, frost, chemicals, plants, ice
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
huge, slow moving sheets of ice