Year 8 Rocks

The three main types of rocks are ...

• Igneous, Sedimentary and volcanic rock.

• Igneous, Metamorphic and magma.

• Igneous, Sedimentary and Metamorphic rocks.

• Igneous, Metamorphic and crystals.

All rocks are formed in the what part of the Earth?

• Core

• Lithosphere

• Mantle

• Outer core

The lithosphere includes the Earth's ____ and upper-most solid mantle

The lustre of a mineral describes ...

• The powdery mark left by a mineral when scraped across a hard surface.

• The ability to scratch a mineral.

• The way that the mineral absorbs light.

• The way that the mineral reflects light.

Match the following

• dull, pearly, waxy, silky and glassy.

• Streak

• determined by scratching.

• hardness

• The powdery mark left when scraped.

• Examples of the lustre of a mineral include...

Recall: The Mohs Hardness Scale tests for hardness of minerals.

Hardness of minerals is based on how one mineral scratched another.

What common object(s) can scratch Feldspar (6.0)?

• Fingernail

• Iron nail

• Steel file and streak plate

• glass, steel file and streak plate

Harvey went to the beach with a group of friends. He picked up a rock and wants to identify it. Using the Rock Identification table, help Harvey identify his rock.

• Phyllite

• Slate

• Marble

• Gneiss

What rock forms from the cooling of molten rock at or below the surface of the Earth?

• Igneous Rock
• Metamorphic Rock
• Sedimentary Rock
• Chemical Rock

Extrusive rocks that form quickly above the Earths surface have

• small crystals
• large crystals
• small and large crystals
• no crystals

Extrusive forms _________crystals

• small
• large