Pg four Flashcards
How much does of the earths crust does silica take up? What is silica also called and what is it’s formula?
95 percent, silica dioxide, SIO2
What is magma inside the earth primarily made up of?
Heavy metals
Are felsic rocks light in color or dark in color or very dark in color?
Light in color
Are felsic rocks high in heavy metals, are they light?
No, they’re not high in heavy metals and because of that they’re VERY light
Are mafic rocks dark in color or light in color or very dark in color?
They’re dark in color
Are ultra mafic rocks very dark in color, light in color, or dark in color?
Very dark!
Are ultra mafic rocks really heavy? and do they have high or low percentages of heavy metals?
They’re very heavy, and they have heavy percentages of heavy metals
What is the specific gravity of mafic rocks?
higher then 3.0
How do sedimentary rocks form?
They form when bits of sediment are compacted and cemented together.
Can any pre existing rock become sedimentary rock? If yes, how?
Yes, it needs to be eroded into sediment
How do pre existing rocks become sediment?
Erosion
