Grade 1 - A History Of The Earth

124 The History of the Earth: Supplemental Guide 6B | The Three Types of Rocks

Three-Column Chart: Types of Rocks

(Instructional Master 6B-1) 15 minutes

Igneous Sedimentary Metamorphic

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Found all over the

earth

Found all over the

earth

Found all over the

earth

Formed over time Formed over time Formed over time

Most common type Least common type

Heat forms magma,

and pressure moves

the magma or lava

to the surface where

it cools and hardens

into igneous rock.

Formed when layers

of sediment are

pressed together for

a long time

Heat and pressure

change igneous or

sedimentary rocks

into metamorphic

rocks.

Examples:

mountains and

boulders; Half

Dome; obsidian;

arrowheads

Examples: coal;

iron ore; sandstone;

limestone

Example: marble

• Tell students that you will use this chart to write down what
  they learned about the three different types of rocks. Tell
  students that you are going to write down what they say, but
  that they are not expected to be able to read what you write
  because they are still learning all the rules for decoding.
  Emphasize that you are writing what they say so that you
  don’t forget. Tell them that you will read the words to them.


• Point to the column for igneous rock. Ask students to
  discuss with their partner what they learned about igneous
  rocks and choose one fact to share with the rest of the
  class. Write down what students share about igneous rocks.


• Follow the same procedures for fi lling in the columns for the
  other two types of rocks.


• Once the chart has been completed, read it to the class.