Rocks and geologic history

What is a mineral

• Synthetic, organic, solid, variable chemistry, definite structure

• Synthetic, inorganic, liquid, variable chemistry, definite structure

• naturally occurring inorganic, gas, variable chemistry, definite structure

• naturally occuring, inorganic, solid, definite chemistry, definite structure

Fine-grained igneous rocks indicate:

• Fast cooling

• Melting of pre-existing rock

• Melting of a source with many minerals

• Rock is part of a pluton

• Slow cooling

Which set of conditions favor melting of a solid, hot rock in the mantle:

• Water, High pressure, Low temp

• Water, Low pressure, High Temp

• no water, high pressure, low temp

• no water, low pressure, low temp

Which magma type has the highest viscosity?

• Basalt

• Andesite

• Rhyolite

The last two minerals to crystallize in a andesitic magma would be?

• Quartz and orthoclase (potassium feldspar)

• Sodium-rich plagioclase and biotite

• Amphibole and plagioclase

• Pyroxene and plagioclase

• Olivine and calcium rich plagioclase

Which igneous texture is classified by crystals you can't see with your eye?

• Phaneritic

• Pegmatite

• Aphanitic

• glassy

The presence of bubbles in a rock must mean:

• Contact metamorphism

• intrusive igneous

• regional metamorphic

• detrital sedimentary

• extrusive igneous

Which mineral in bowen's reaction series contains a substitution of sodium for calcium

• Plagioclase

• Orthoclase (potassium feldspar)

• Amphibole

• Mica

Detrital sedimentary rocks can be derived from:

• Igneous rock

• igneous and sedimentary rocks

• Igneous, metamorphic and sedimentary rocks

• Igneous and metamorphic rocks

Which of the following rocks might give clues about climate conditions in Earth's past?

• Sandstone

• Gniess

• Absarokite

• Rhyolite