Rocks and Their Formation

What is the primary difference between lava and magma?

• Lava is molten rock outside the volcano, while magma is inside.

• Lava is found inside the volcano, while magma is outside.

• Lava is cooler than magma.

• Lava forms igneous rocks, while magma does not.

How do extrusive igneous rocks differ from intrusive ones?

• Extrusive rocks have large crystals, while intrusive rocks have small crystals.

• Extrusive rocks form inside the volcano, while intrusive rocks form outside.

• Extrusive rocks are porous, while intrusive rocks are non-porous.

• Extrusive rocks form from quickly cooled lava, while intrusive rocks form from slowly cooled magma.

Which of the following is a characteristic of basalt?

• It is used in kitchen countertops.

• It has large crystals.

• It forms from slowly cooled magma.

• It is a strong material used in construction.

What conditions are necessary for the formation of metamorphic rocks?

• Volcanic activity

• Heat and pressure

• Erosion and sedimentation

• Cooling and crystallization

Which metamorphic rock is formed from limestone?

• Marble

• Gneiss

• Schist

• Slate