Igneous Rocks

Which igneous rock could physically weather beach sand that contains the minerals pyroxene, plagioclase feldspar and olivine?

• dunite

• Peridotite

• Granite

• gabbro

The photograph below shows a magnified view of a portion of a rock that can float if placed in water. Which terms best describe this rock?

• non-crystalline and vesicular

• coarse and non-vesicular

• elastic and fragmental

• foliated and banded

Which processes lead directly to the formation of igneous rock?

• weathering and erosion

• compaction and cementation

• heat and pressure

• melting and solidification

Which texture best describes an igneous rock that formed deep underground?

• glassy

• vesicular

• fine grained

• coarse grained

What is the color and type of rock that forms oceanic crust at mid-ocean ridges?

• light colored and igneous

• light colored and sedimentary

• dark colored and igneous

• dark colored and sedimentary

The flowchart below illustrates the change from melted rock to basalt. The solidification of the melted rock occurred

• slowly, resulting in fine-grained minerals

• slowly, resulting in coarse-grained minerals

• rapidly, resulting in coarse-grained minerals

• rapidly, resulting in fine-grained minerals

Which graph best represents the relative densities of three different types of igneous rock?

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Which igneous rock is dark colored, cooled rapidly on Earth's surface and is composed mainly of plagioclase feldspar, olivine and pyroxene?

• obsidian

• gabbro

• rhyolite

• scoria

Biotite mica and muscovite mica have different chemical compositions. Compared to the magma from which biotite mica forms, the magma from which muscovite mica forms is usually

• more mafic and less dense

• more mafic and more dense

• more felsic and less dense

• more felsic and more dense

Tags

NGSS.MS-PS1-2

The photograph below shows the intergrown crystals of a pegmatite rock. Which characteristic provides the best evidence that this pegmatite solidified deep underground?

• low density

• light color

• felsic composition

• very coarse texture