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Franco has a rock in his collection that is very smooth and glassy. He knows that the rock was formed by lava that cooled very quickly after a volcanic eruption. Which kind of rock does Franco have?

Group of answer choices

concrete

igneous

metamorphic

sedimentary

Benji is writing some observations of different samples in his mineral collection. Which of the following terms can both be used to describe luster?

Group of answer choices

hard and coarse

metallic and soft

grainy and rough

glassy and metallic

Shane uses a hand lens to examine a piece of granite rock. He observes that the granite is made up of very large crystals.

Group of answer choices

minerals

fossils

soils

shells

1: Igneous: Igneous rocks are formed by cooling magma. The location of the formation of the rock, as well as how fast the magma cools will determine the type of igneous rock.

2: Glassy and Metallic: Luster definition; the state or quality of shining by reflecting light; glitter, sparkle, sheen, or gloss: the luster of satin.

3: Minerals: The large mineral crystals in granite are evidence that it cooled slowly from molten rock material.