Earth's History and the Rock Cycle

The Rock Cycle

The Rock Cycle

• Definition: The continuous process of rocks changing from one type to another over time.

• Three Types: Igneous, Sedimentary, and Metamorphic rocks

Multiple Choice

What are the three main types of rocks involved in the rock cycle?

• Igneous, sedimentary, and metamorphic

• Sedimentary, volcanic, and metamorphic

• Igneous, sedimentary, and volcanic

• Metamorphic, volcanic, and sedimentary

Three Types of Rocks

• Sedimentary rocks are formed from the accumulation and compaction of sediments.

• Metamorphic rocks are formed from the transformation of existing rocks due to heat and pressure.

• Igneous rocks are formed from the cooling and solidification of molten rock.

Multiple Choice

How are sedimentary rocks formed?

• From the cooling and solidification of molten rock

• From the transformation of existing rocks due to heat and pressure

• From the accumulation and compaction of sediments

• From the erosion and weathering of rocks

Sedimentary Rocks

Sedimentary rocks are formed from the accumulation and compaction of sediments. Over time, layers of sediment build up and are compressed, creating rocks like sandstone, limestone, and shale. These rocks often contain fossils, providing valuable clues about Earth's history. Sedimentary rocks cover about 75% of the Earth's surface, making them an important part of our planet's geology.

Multiple Choice

How are metamorphic rocks formed?

• From the cooling and solidification of molten rock

• From the transformation of existing rocks due to heat and pressure

• From the accumulation and compaction of sediments

• From the erosion and weathering of rocks

Metamorphic Rocks

Metamorphic rocks are formed deep inside the Earth under extreme heat and pressure. Over time, as the lower layers of the crust are mashed together the rock layers get smashed adn twisted together. This leaves unique patterns and colors in the rocks.

Multiple Choice

How are igneous rocks formed?

• From the cooling and solidification of molten rock

• From the transformation of existing rocks due to heat and pressure

• From the accumulation and compaction of sediments

• From the erosion and weathering of rocks

Igneous Rocks

Igneous rocks are formed when magma or lava cools and solidifies. There are two types of igneous rocks. Intrusive igneous rocks form from magma cooling inside the Earth's crust. Extrusive igneous rocks from lava cooling on top of Earth's crust.