01/05/23

Rocks and WeatheringRocks and Weathering

01/05/23What are rocks?What are rocks?Rocks are made from a combination of minerals and can be hard or soft depending on how the minerals are arranged.

Rocks can be found here…

…and here……and here…

…and here

01/05/23Some examples of erosion…Some examples of erosion…

01/05/23

The Needles, Isle of Wight

01/05/23

01/05/23

01/05/23

1890

01/05/23

1910

01/05/23

1940

01/05/23

1975

01/05/23

Present day

01/05/23Erosion experiments…Erosion experiments…Experiment 1: Shaking rocks in a bottle In this experiment we… This showed what happened when rocks travel with a stream.

Experiment 2: Acid on limestone In this experiment we… This showed the damage that can be caused by acid rain.

Experiment 3: Heating and cooling a rock In this experiment we… This showed the damage that can be done when a rock is heated and cooled, like during the day and night.

Describe what you did here…

01/05/23Rock fragmentsRock fragments

When rocks are transported by a river they are eroded:

When rocks are broken off they can form “scree

slopes”

Rock shape up here

Rock shape down here

“Sediment”

01/05/23

Weathering by ice

“Onion skin” weathering

01/05/23Erosion and weathering…Erosion and weathering…

EROSION is when rocks are gradually worn down.

WEATHERING is when rocks are broken up into smaller ones.

The ultimate result of both of these processes is SOIL.

01/05/23Examples of erosion…Examples of erosion…Erosion Physical,

chemical or biological?

Rocks bumping into each other while travelling down a streamTree roots pushing against the rock

Ice getting into cracks and expanding

Acid rain

Animals or plants digging into cracks

“Onion skin weathering”