4a earth and moon our home and our nearest neighbor
Post on 20-Dec-2015
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4A4A
Earth-Moon System
• Distance from the earth to the moon:– 384,000 km– Less than the radius of
the Sun (696,000 km)
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Differentiation and Heat
• A differentiated planet is not the same all the way through. A homogeneous planet is the same.
• Heating a planet allows movement.
• Heavier materials sink to the inside and lighter materials rise.
Sources of Heat
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Rocks
• Rocks are made of minerals
• Types of rocks:– Igneous rocks are those that have formed
from a molten state (volcano made)– Sedimentary rocks are composed of
fragments of other rocks that are cemented together (water made)
– Metamorphic rocks are produced from either igneous or sedimentary rocks that have been buried and modified by high temperatures and pressures
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Why does the earth look like this?
Processes that alter the surface of the earth:
• Endogenic– Forces that act from
inside the earth:• Volcanic • Erosional• Tectonic
– These forces can make rocks
• Exogenic– Forces that act from
outside the earth:• Cratering
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