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Structure of the Earth
Not so solid Earth
The Earth has three levels:
• Core,
• Mantle,
• Crust
• Is the center of the earth
• Consists of iron and nickel
Mantle• Surrounds the core
• Consists of the earth’s mass
• Contains molten rock called magma
Crust
• Thin layer of rock at the earth’s surface
On and above the earth
AtmosphereLithosphereHydrosphereBiosphere
Atmosphere• A layer of gases surrounding the
earth• Contains the oxygen we breathe• Protects earth from radiation and
space debris• Provides medium for weather and
climate
LithosphereThe outer shell of the earthIncludes the crust and uppermost mantle
Together, the hydrosphere, lithosphere, and atmosphere form the.
. .
biosphere
Continental Drift Theory
• Presented by Alfred Wegener
• Earth was once a supercontinent that divided and slowly drifted apart over millions of years
• Wegener called the supercontinent Pangea(all earth)
Do the continents continue to drift today?
How can the presence of seven continents on the
earth's surface be explained?