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2.1 Igneous Rocks Composition and Formation

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2.1 Igneous Rocks Composition and Formation

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Questions and Answers

What type of rocks result from slow cooling of magma?

Coarse-grained plutonic rocks (correct)

Fine-grained volcanic rocks

Nepheline

Basalts

Which rock types are more plentiful among plutonic rocks than the others combined?

Olivine

Basalts

Granites and granodiorites (correct)

Andesites

What is the result of rapid cooling during an eruption?

Coarse-grained plutonic rocks

Finer-grained volcanic rocks (correct)

Olivine

Granites

Which mineral is formed when the melt is deficient in silica?

Nepheline Signup and view all the answers

What factor influences the rate of chemical weathering during soil formation?

Chemical variations in various rock types Signup and view all the answers

What is the primary reason that sedimentary rocks are important for soil formation?

They are less consolidated than igneous rocks, allowing for more rapid biotic invasion and deep, productive soil development. Signup and view all the answers

Which of the following is NOT a type of sedimentary rock mentioned in the passage?

Gneiss Signup and view all the answers

What is the primary mechanism by which calcium carbonate and dolomite accumulate in sedimentary limestone deposits?

Chemical and biochemical precipitation in ocean waters. Signup and view all the answers

Which type of metamorphic rock is formed by the compression and alteration of shales and mudstones?

Slate Signup and view all the answers

What is the defining characteristic of quartzite, a metamorphic rock?

It is highly resistant to weathering due to its high quartz content. Signup and view all the answers