Rocks

Question 1

What is a rock?

Answer 1

A solid mass of mineral or mineral-like matter occurring naturally as part of our planet.

Question 2

What is an igneous rock

Answer 2

Rock formed by the crystallization of molten magma.

Question 3

What are sedimentary rocks?

Answer 3

Rocks formed from the weathering products of preexisting rocks that have been transported, deposited, compacted and cemented.

Question 4

What are metamorphic rock?

Answer 4

Rock formed by the alteration of pre-existing rock deep within the Earth (but still in the solid state) by heat, pressure, and/or chemically active fluids.

Question 5

Explain the rock cycle

Answer 5

Magma->Lava->Weathering->Sediment

Question 6

What are the two types of igneous rock?

Answer 6

• Intrusive (formed when magma hardens beneath Earth’s surface)
• Extrusive (formed when lava hardens)

Question 7

How are igneous Rocks classified?

Answer 7

Texture (grain size) and Composition

Question 8

How are sedimentary rocks formed?

Answer 8

Compaction (squeezes/compacts sediments)

Cementation (disolved minerals fill tiny spaces)

Question 9

How are sedimentary rocks classified?

Answer 9

• Clastic (composed of weathered bits)
  
  • Classified by partical size
  • Exmaples: Shale, Sandstone, Conglomerate
• Chemical (dissolved substances precipitate)
  
  • Examples: limestone, chert, coal, rock salt

Question 10

How are metamorphic Rocks formed?

Answer 10

• Formed with elevated temperatures and pressures deep under Earth’s surface.
• Contact metamorphism occurs when magma moves into rock.

Question 11

How are metamophic rocks classified?

Answer 11

Texture (foliated?), grain size, parent rock.