Igneous Rocks

Which volcanic rock is extremely vesicular and glassy?

Why are lava flows typically finer-grained than intrusive igneous rocks?

Which of the following pairs of igneous rocks exhibit aphanitic texture?

In a porphyritic volcanic rock, which mineral grains are the last to crystallize?

What ultramafic rock is thought to be common in Earth's mantle but rare in the crust?

Of those below, which igneous rock or magma has the lowest silica (SiO2) content?

Which term describes a texture of igneous rocks that crystallized over a single, long period?

Which texture listed below would be most unlikely to occur in an extrusive igneous rock?

The last minerals to crystallize on Bowen's Reaction Series result in igneous rocks with a ____________ composition

Named for a mountain range in South America, which rock forms from volcanic activity there?

Which of the following rocks is composed mainly of ferromagnesian minerals?

Which of the following is a factor that does not affect the generation of magma?

Which rock would be most likely to contain visible quartz and potassium feldspar crystals?

Which of the following minerals crystallize early in Bowen's reaction series?

What is the dominant lava erupted from volcanoes on Hawaii and Iceland?

Which of the following igneous rocks has a pyroclastic texture, meaning it was formed from a glowing avalanche?

What type of igneous rock consists of very coarse crystals

What do pumice and obsidian have in common?

What term describes the sizes, shapes, and arrangements of mineral grains in an igneous rock?

What is the dominant feldspar in basalt?

A ____________ is an open cavity in a volcanic rock that was filled by a gas bubble when the lava was still mainly liquid

Why would a plume of solid silicate rock rising slowly from deep in the mantle begin melting as it neared the abse of the lithosphere

Which term describes the changing of the composition of magma by incorporating surrounding host rock

Which of the following are used for studying rocks with a polarizing or petrographic microscope

Which of the following rocks has the same mineral composition as andesite