Nat Sci: Physical Science

1. Chemical weathering occurs when
chemical processes cause rocks to
dissolve or decompose.
also known as decomposition or decay.
It is a way where rocks are broken down
and chemically altered.

3. Oxygen reacts with iron
to form iron-oxide,
commonly called rust.
Rust is easily
breakable.
Oxidation commonly
occurs in materials that
contain iron-bearing
minerals.
It causes the red hues
in rocks.

4. Olivine and Limonite are examples of rocks that contain
Iron (Fe), which are susceptible to Oxidation.

5. •chemical breakdown of a substance
when combined with water.
•Water changes the chemical
composition and size of minerals in
rock, making them less resistant to
weathering.

7. Carbonation is the mixing of water with
carbon dioxide to make carbonic acid. This
type of weathering is important in the
formation of caves. Dissolved carbon
dioxide in rainwater or in moist air forms
carbonic acid, and this acid reacts with
minerals in rocks.