Unformatted text preview: io of sodium that
characterized the magma?
What might be the origin of a rock composed almost
entirely of olivine?
The mantle Thought questions for this chapter
What processes create the unequal sizes of crystals in
2 different rates of cooling
different 2. How Do Magmas Form?
How Why do rocks melt? 2. How Do Magmas Form?
How What is a magma chamber?
A rising mass of magma that
pushes aside crustal rocks as
it rises through the crust. 2. How Do Magmas Form?
How A temperature of about 1000°C
is required for partial melting of
A depth of at least 40 km is
required for temperatures of
1000°C to occur. 3. Magmatic Differentiation
Magmatic A process by which rocks of
varying composition c...
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- Summer '08
- Igneous rocks, Basalt