Unit 3 Lesson 3

Question 1

Rock

Answer 1

A combination of one or more minerals or organic matter

Question 2

Composition of rock

Answer 2

The makeup of rock
Determined by the minerals and organic matter a rock contains

Question 3

Texture of rock

Answer 3

Determined by the size, shape, and positions of the grains that make up a rock

The texture of a rock may give clues as to how @nd where it was fo4med

Question 4

What are 2 kinds of igneous rock?

Answer 4

Intrusive igneous rock - forms when magma does not reach earth’s surface. Generally has a coarse-grained texture. Examples: granite and diorite

Extrusive igneous rock - forms when lava erupts onto earth’s surface. Lava cools quickly so has a fine - grained texture. Examples: obsidian and basalt

Question 5

What are 3 types of sedimentary rock?

Answer 5

Clastic Sedimentary Rock - forms when sediments are buried and cemented together by calcite or quartz

Chemical Sedimentary Rock - forms when water evaporates and the minerals on the water precipitate out of solution and crystallize. Example halite (rock salt)

Organic Sedimentary Rock - forms from the remains of fossils. Examples coal and limestone

Question 6

What are 2 types of metamorphic rock?

Answer 6

Foliated metamorphic rock - forms when pressure causes the mineral grains in a rock to realign to form parallel bands. Examples: slate, phyllite, schist and gneiss

Nonfoliated metamorphic rock - do not have mineral grains aligned in parallel bands. Usually made of 1 or just a few minerals. Examples: marble and quartzite