science 3g ch 3c mcgrath soils science review chapter 3c flash cards!
TRANSCRIPT
Science 3G Ch 3CMcGrath
SoilsScience
ReviewChapter 3C Flash Cards!
What is soil?
• the loose material in which plants can grow
in the upper layer of EarthSocial Studies 3G
Ch 3f
Why is soil important?
•Soil contains the minerals all living
things need.Social Studies 3G
Ch 3f
Name the 4 parts of soil
• weathered rock
• humus
• air
• waterSocial Studies 3G
Ch 3f
Material made up of decayed parts of once-living things is
humus
Social Studies 3GCh 3f
Soil is a nonrenewable resource. It can not be replaced in a
lifetime. How many years does it take to make 1 inch of soil?
•500-1,000 years
Social Studies 3GCh 3f
Name the 3 layers of soil
• topsoil
•subsoil
•bedrockSocial Studies 3G
Ch 3f
The richest layer of soil is
•Topsoil
Social Studies 3GCh 3f
Describe topsoil
• The top layer of soil. It is made of the smallest grains and has the most humus. This makes it the
richest layer of soil, and good for growing plants.
Social Studies 3GCh 3f
Describe subsoil
• The layer under topsoil. It has larger grains and less
humus than topsoil.
Social Studies 3GCh 3f
Describe bedrock
• The solid rock under the soil. Weathering breaks down the bedrock into soil. Bedrock is made of different
minerals in different places. So different soils have different minerals.
Social Studies 3GCh 3f
Name the 3 types of soil
•sand
• loam
•claySocial Studies 3G
Ch 3f
A type of soil that has large grains. It also has large spaces
between the grains which causes water to drain quickly.
•sand
Social Studies 3GCh 3f
A type of soil that has small grains and holds water easily.
It can stick together.
•clay
Social Studies 3GCh 3f
A type of soil which has both large and small grains. It has lots
of humus, which makes it dark and rich. It holds enough water for plants, but also drains well.
loam
Social Studies 3GCh 3f
Material found in nature that living things use is
resource
or
natural resourceSocial Studies 3G
Ch 3f
Saving resources by using them carefully is
• conservation
• Soil is a nonrenewable resource. It must be saved.
Social Studies 3GCh 3f
Name 3 ways to conserve soil
•do not till the soil
•strip cropping
•contour plowingSocial Studies 3G
Ch 3f
Planting rows of thick grass or clover between crops is
called…
strip cropping
Social Studies 3GCh 3f
A type of plowing which helps keep soil from washing down
hill is…
•contour plowing
Social Studies 3GCh 3f
What is a mixture of decaying organisms such as leaves,
which turns into soil quickly
•compost
Social Studies 3GCh 3f
The best soil for growing plants is…
• loam
Social Studies 3GCh 3f
How does bedrock turn into soil?
• weathering• Wind, rain and roots of plants break down rock
into smaller piecesSocial Studies 3G
Ch 3f
How can water help topsoil?
• Water that soaks into topsoil is needed for
plants to grow.
Social Studies 3GCh 3f
How can water hurt topsoil
• water can erode topsoil. Erosion is the washing away of soil.
Social Studies 3GCh 3f
How do minerals end up in our bodies?
•Minerals are absorbed by plants from the soil. Animals eat the plants.
Social Studies 3GCh 3f
How do plants stop erosion?
•Roots hold soil in place so it cannot
wash away.Social Studies 3G
Ch 3f
How can farming hurt soil?
• Growing the same crop year after year causes the
soil to loose all the minerals needed.
Social Studies 3GCh 3f
Use the next link to watch a Discovery Education video on soil.
http://assignments.discoveryeducation.com/?cdPasscode=TF8A9-1D45
Science Select resources
http://www.soil-net.com/cms_test/
http://www.ars.usda.gov/is/kids/scientists/soilscientist.htm
http://crafts.kaboose.com/laundry-bottle-pet-food-scoop.html
http://crafts.kaboose.com/holidays/earth-day/earth_day_crafts.html
Social Studies 3GCh 3f