Why are intrusive igneous rocks coarse-grained and extrusive rocks fine-grained?
What kinds of minerals would you find in a mafic igneous rock?
What kinds of igneous rocks contain quartz?
Name two intrusive igneous rocks with a higher silica content than that of gabbro.
What is the difference between a magma formed by fractional crystallization and one formed by ordinary cooling?
How does fractional crystallization lead to magmatic differentiation?
Where in the crust, mantle, or core would you find a partial melt of basaltic composition?
In which plate tectonic settings would you expect magmas to form?
Why do melts migrate upward?
Where on the ocean floor would you find basaltic magmas being extruded?