The two main categories of igneous rocks are ____________________ and ____________________
Fill in the blank(s) with correct word
volcanic, plutonicplutonic, volcanicextrusive, intrusiveintrusive, extrusive
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The earliest crust was probably ____
a. rich in precious metals b. composed of felsic igneous rock c. composed of ultramafic rock d. very similar to the one of today e. composed of basaltic rock
Match the energy source with the correct description.?
A. ?solid fossil fuel formed from the remains of land plants B. ?can be refined into various fuels and other components with different boiling points C. ?a mixture of gases, of which 50-90% is methane D. ?liquid fuel produced from coal E. ?uranium-235 nuclei are split into light nuclei
Follow the geothermal gradient to the depth of 100 km. In which state of matter will peridotite exist at 100 km?
What will be an ideal response?
Earth's oceanic crust is older than the continental crust.
Answer the following statement true (T) or false (F)