Rocking Around the Earth: A Journey Through the Rock Cycle

• What are the three main types of rocks?

• How are igneous rocks formed? Give examples of intrusive and extrusive igneous rocks.

• How are sedimentary rocks formed? Give examples of clastic, chemical, and organic sedimentary rocks.

• How are metamorphic rocks formed? Give examples of foliated and non-foliated metamorphic rocks.

• Explain the rock cycle.

Tags

NGSS.MS-ESS2-1

Which type of rock is formed under heat and pressure?

• Sedimentary rock

• Igneous rock

• Metamorphic rock

• Mineral rock

Answer explanation

Metamorphic rock is formed when existing rocks are subjected to intense heat and pressure, causing physical and chemical changes. In contrast, sedimentary rocks form from sediment, and igneous rocks originate from cooled magma.

Which type of rock is formed from the accumulation of sediment?

• Sedimentary rock

• Igneous rock

• Metamorphic rock

• Mineral rock

Answer explanation

Sedimentary rock is formed from the accumulation and compaction of sediment, such as sand, mud, and minerals. This distinguishes it from igneous and metamorphic rocks, which form through different processes.

Which type of rock is formed from cooled magma or lava?

• Sedimentary rock

• Igneous rock

• Metamorphic rock

• Mineral rock

Answer explanation

Igneous rock is formed from the cooling and solidification of magma or lava. Sedimentary rocks form from sediment, while metamorphic rocks arise from existing rocks under heat and pressure. Mineral rock is not a recognized category.

What is the term for the natural substance that makes up rocks?

• Lava

• Minerals

• Magma

• Streak color

Answer explanation

The term for the natural substance that makes up rocks is 'minerals'. Minerals are solid, naturally occurring substances with a defined chemical composition, while lava and magma are molten rock, and streak color refers to the color of a mineral's powder.

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS3-1

You are a geologist studying a newly discovered rock formation. You find evidence of fossils, distinct layering, and a mixture of rounded pebbles and sand grains cemented together. Based on this evidence, what type of rock is it most likely to be? Justify your answer by explaining at least three specific observations that support your conclusion, linking them to the rock's formation process. Then, predict what two different rock types this formation could eventually transform into if subjected to significant heat and pressure, and explain the metamorphic processes involved.

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

NGSS.MS-LS4-1