Rocks

1
Rocks

• 8th grade Earth Science

2
Classifying Rocks

• ________________ rocks are made of mixtures of
  minerals and other materials. Some contain a
  single mineral. Others contain several minerals.
• _________ color provides clues to the rocks
  mineral composition.
• (Ex granite light basalt dark)
• _________- the look and feel of the rocks
  surface.
• They use shape, size and pattern.
• __________ how the rock is formed.

3
3 Types of Rocks

• There are 3 major groups of rocks
• ___________________
• ___________________
• ___________________

4
Igneous Rocks

• The name igneous comes from a Latin word meaning
  ________.
• Igneous rocks can be either __________ or
  ____________ rock.
• _____________ formed from lava that erupted
  onto the Earths surface.
• Basalt is the most common extrusive rock.
• ____________ formed from magma that hardens
  beneath the Earths surface.
• ____________ is the most common intrusive rock.

5
Igneous Rocks

• Obsidian
• extrusive
• Granite
• intrusive

6
Sedimentary Rocks

• Sedimentary rocks are formed through a series of
  processes
• _______________
• _______________
• _______________
• _______________

7
Sedimentary Rocks

• _________ water, wind or ice loosen and carry
  away fragments of rock.
• __________ sediment settles out of the water or
  wind carrying it.
• ___________ process that presses the sediments
  together.
• ____________ dissolved minerals crystallize and
  glue particles of sediment together.

8
Types of Sedimentary Rocks

• There are 3 major groups of sedimentary rocks
• _________ forms when rock fragments are
  squeezed together.
• _________ remains of plants or animals are
  deposited in thick layers.
• _________ when minerals that are dissolved in a
  solution crystallize.

9
Sedimentary Rocks

• Clastic
• sandstone
• Organic
• coal
• Chemical
• limestone

10
Metamorphic Rocks

• ________ and ___________ deep beneath Earths
  surface can change any rock into metamorphic
  rock.
• Geologists classify metamorphic rocks according
  to the arrangement of the ___________ that make
  up the rocks.

11
Metamorphic Rocks

• There are 2 classifications for metamorphic
  rocks
• ___________ have their grains arranged in
  parallel layers or bands.
• ___________ mineral grains are arranged
  randomly. They do not split into layers.

12
Metamorphic Rocks

• Foliated
• gneiss
• Nonfoliated
• quartzite

13
The Rock Cycle

• The rock cycle is the series of processes on
  Earths surface and in the crust and mantle that
  slowly change rocks from one kind to another.

14
(No Transcript)