Earth's Layers and Rock Cycle

Mrs. Todd introduces the lithosphere, explaining its composition and the Earth's layers: crust, mantle, and core. She details the lithosphere's stability and its role in the geosphere. The rock cycle is described, covering igneous, sedimentary, and metamorphic rocks, and how they transform over time. The lesson concludes with a summary and a look ahead to the next chapter.

What is the lithosphere primarily composed of?

• Water and air

• Solid rocks and minerals

• Molten lava

• Gaseous elements

Which layer of the Earth is the thinnest?

• Mantle

• Core

• Crust

• Lithosphere

What is the geosphere composed of?

• The hydrosphere

• The atmosphere

• All rocks and minerals on Earth

• Only the Earth's crust

What can cause movements and cracks in the lithosphere?

• Stable conditions

• Movements in the mantle

• Erosion by water

• Changes in the atmosphere

What is the rock cycle?

• A cycle that only occurs in the ocean

• A process that forms only sedimentary rocks

• A natural continuous process of rock formation and transformation

• A process of forming only igneous rocks

Which type of rock is formed when magma cools and solidifies?

• Igneous rock

• Metamorphic rock

• Sedimentary rock

• Limestone

What happens to igneous rocks during the rock cycle?

• They remain unchanged

• They are broken down into sediments

• They turn directly into magma

• They become gaseous

How are sedimentary rocks formed?

• By volcanic eruptions

• By cooling of magma

• By compaction of sediments over time

• By melting of metamorphic rocks

What is an example of a metamorphic rock?

• Basalt

• Granite

• Sandstone

• Marble

What is the final stage in the rock cycle before it repeats?

• Formation of metamorphic rock

• Formation of sedimentary rock

• Melting into magma

• Cooling into igneous rock