How to destroy a rock

Your hot than your cold

What we are going to achieve today

• Investigate which rocks are porous and take in water

• Know that heating and freezing rocks will damage them

• Understand changes in rocks and building materials over time.

• Remember acid erosion is chemical weathering

Key word, wordsearch

Chemical Weathering

Acid Rain

Acid Rain• Compounds from burning coal, oil and gas

react chemically with water forming acids.• Acid rain causes very rapid chemical

weathering

Weathering

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

Physical Weathering

• Process by which rocks are broken down into smaller pieces by external conditions.

• Types of Physical weathering– Frost heaving and Frost wedging– Plant roots– Friction and impact– Burrowing of animals– Temperature changes

Frost Wedging

Plant Roots

Friction and Repeated Impact

Burrowing of Animals

Temperature Changes

Erosion

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

Water Erosion

• Rivers, streams, and runoff

Ice Erosion

• Glaciers

Wind Erosion

Mass Movements

• Landslides, mudslides, slump and creep

landslide clip.mpeg

Life of a rock

• Imagine you were a rock, would you be happy?

• Tell the world about how every one is against you, go on have a good moan, with your neighbour.

Letting in the water

• Water is a dangerous thing for a rock.

Some rocks have it worse than others, we are going to do an experiment to see if rocks absorb water, If they do they are said to be porous!

Are Rocks Porous?

Method• Weigh rocks• Place in water• Leave for at least 20 minutes• Weigh again• Has it increased weight and taken in water

What happens when the water is in the rock

Where would you place your statue?