This document summarizes different types of weathering that break down rocks and earth materials. It describes physical weathering which breaks rocks into smaller pieces through frost cracking, temperature changes, and impacts. Chemical weathering alters rocks through chemical reactions, using agents like water, oxygen, carbon dioxide, and acids. Biological weathering occurs as organisms like plants and burrowing animals contribute to chemical and physical breakdown. The document also briefly discusses erosion as the transport of weathered materials by water, wind, ice or gravity.

2. The breakdown do the materials of
Earth’s crust into smaller pieces.

3.  Process by which rocks are broken down
into smaller pieces by external
conditions.
Types of Physical Weathering
• Frost heaving and Frost wedging
• Friction and impact
• Temperature changes

7.  The process that breaks down rock
through chemical changes.
The agents of chemical weathering
› Water
› Oxygen
› Carbon dioxide
› Living organisms
› Acid rain

8.  Water weathers rock by dissolving it

9.  Iron combines with oxygen in
the presence of water in a
processes called oxidation
 The product of oxidation is
rust

10.  CO2 dissolves in rain water and creates
carbonic acid
 Carbonic acid easily weathers limestone
and marble

11.  Lichens that grow on rocks produce
weak acids that chemically weather
rock

12.  Compounds from burning coal, oil and
gas react chemically with water forming
acids.
 Acid rain causes very rapid chemical
weathering

13.  A type of landscape in rainy regions where
there is limestone near the surface,
characterized by caves, sinkholes, and
disappearing streams.
 Created by chemical weathering of
limestone

17. In biological weathering, animals & other
organisms cause rocks to breakdown
through chemical and physical
processes. It includes:
 Plant roots
 Burrowing of animals

20.  The process by which water, ice, wind or
gravity moves fragments of rock and soil.

21.  Rivers, streams, and runoff

22.  Glaciers

24. Landslides, mudslides, slump and creep