4th grade ch 10 lesson 1 what are natural resources
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Ch. 10 Ch. 10 Lesson 1Lesson 1What are What are natural natural
resources?resources?
natural resourcesnatural resourcessupplies that nature provides
natural resourcesnatural resources
renewable renewable resourcesresources
can be replaced
Renewable Resources [04:02]
solar energysolar energyenergy from sunrenewable
soilsoilcreated by weathering,erosion & deposition
Different types of Different types of rocks and minerals rocks and minerals are found in soil.are found in soil.
important to conserve soil-takes
1,000 yrs. to renew soil
soil layerssoil layerstopsoil top layer of soil-
contains humus
subsoil near surface-made of soil & small rocks
bedrock made up mostly of solid rock
humushumusdecomposing plant & animal remains in soil
Living things break down plant Living things break down plant and animal remains into and animal remains into
nutrients that plants can use.nutrients that plants can use.
types of soiltypes of soil
1. clay
2. silt
3. sand
1. clay1. claysmallest particlesused to make clay, tile & bricks
2. silt2. siltslightly larger particles than clay
3. sand3. sandlargest particlesmost common mineral=quartz
used to make glass
Good soil for plants is the right mixture of clay, silt, sand and humus with many nutrients.
Review TimeReview Time
natural resourcesnatural resourcessupplies that nature provides
renewable renewable resourcesresourcesresources that can
be replaced
types of soiltypes of soil
1. clay
2. silt
3. sand
clayclaysmallest particles
sandsandlargest particles
Good soil for plants is the right mixture of clay, silt, sand and humus with ______________nutrients.
many
sandsandmost common mineral=quartz
used to make glass
siltsiltslightly larger particles than clay
clayclayused to make clay, tile & bricks
Getting to Know Soil 23:00