NATURAL SCIENCES GRADE 5 The Surface of the Earth: Soil
Slide 3
Rocks break up in many ways to form sand grains NATURAL
SCIENCES GRADE 5 http://www.youtube.com/watch?v=99rGsXc9yWY
Slide 4
Rocks get cracks in the surface Water makes cracks bigger
Pieces of rock break off NATURAL SCIENCES GRADE 5
Slide 5
A little bit of water is found in soil Roots of plants make the
water acidic Acid water breaks the surface of the stone Rain water
can also wear down the surface of stones NATURAL SCIENCES GRADE
5
Slide 6
When water moves them When the wind blows them against other
bigger stones When people and animals walk on a path and kick
stones Small stones become sand NATURAL SCIENCES GRADE 5
Slide 7
Plants need soil because: The soil anchors the plant The plant
gets water from soil The plant gets minerals from soil Plants
reproduce and the seeds need soil Can you remember what else plants
need to grow? Lets watch the video
http://www.youtube.com/watch?v=OQT6piZOX7c NATURAL SCIENCES GRADE
5
Slide 8
Animals need soil because: The soil is their habitat Animals
need plants to survive NATURAL SCIENCES GRADE 5
Slide 9
Earths crust has different layers The layers are arranged in a
specific order 1. Topsoil 2. Subsoil 3. Rock NATURAL SCIENCES GRADE
5
Slide 10
Top layer of soil Where plants grow Animals live here Dark in
colour Takes a very long time to form Made up of: small sand grains
(broken down rocks) plant and animal matter air Water NATURAL
SCIENCES GRADE 5
Slide 11
Layer beneath the topsoil Lighter in colour than top soil Roots
of trees anchor themselves Made up of: bigger rock pieces small
parts from top soil NATURAL SCIENCES GRADE 5
Slide 12
Bottom layer of land Big pieces of solid material Very deep
down, the rock pieces become bigger too Rock
Slide 13
Many animals live in soil Earthworms movements help to loosen
soil particles More air available Animals that live here are a
source of food for other animals NATURAL SCIENCES GRADE 5