Geological Processes Quiz

The basaltic bedrock of the oceanic crust is classified as

• felsic, with a density of 2.7 g/cm3

• felsic, with a density of 3.0 g/cm3

• mafic, with a density of 2.7 g/cm3

• mafic, with a density of 3.0 g/cm3

Which property is most useful in distinguishing pyroxene from amphibole?

• sample size

• hardness

• type of luster

• angles of cleavage

The minerals listed in the table are varieties of which mineral?

• garnet

• magnetite

• quartz

• olivine

Dolostone is classified as which type of rock?

• land-derived sedimentary rock

• chemically formed sedimentary rock

• foliated metamorphic rock

• nonfoliated metamorphic rock

Base your answers to questions 7 through 9 on the cross section below. Rock units are labeled 1 through 8. The line between A and A indicates an unconformity. Which characteristic of the granite intrusion provides the most evidence that it solidified deep underground?

• very hard

• coarse texture

• light color

• felsic composition

Which rock most probably formed in the contact metamorphic zone from siltstone?

• marble

• basalt

• quartzite

• hornfels

Which processes formed the granite that is mined in Vermont?

• compaction and cementation of sediments

• cooling and solidification of magma

• uplift and weathering of bedrock

• application of heat and pressure to shale

Some of the bedrock in the Green Mountains is actually green in color because of the presence of the mineral chlorite. Which other mineral can cause rocks to appear green?

• sulfur

• magnetite

• olivine

• halite

Which mineral has a metallic luster, a black streak, and is an ore of iron?

• galena

• magnetite

• pyroxene

• graphite

Which statement is best supported by the diagram?

• A fingernail will scratch calcite but not gypsum.

• Calcite will be scratched by a copper penny.

• The mineral apatite will scratch topaz.

• A steel file has a hardness of about 6.5.