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Earth's Cycles (Water Cycle), AND Human Impact Brown 15-16
Transcript of Earth's Cycles (Water Cycle), AND Human Impact Brown 15-16
•nutrients come from minerals or organic matter in soil
•pH: a measure of the acidity of soil
•farmers may apply lime to make soil less acidic
•spaces between particles
•air and water move through these spaces
•plants need water and air to grow
1. Earth's Cycles (Water Cycle)
Describe how water, carbon, and nitrogen travel across the Earth's surface, under the Earth's surface, and across the atmosphere
Describe how energy travels across an ecosystem
•Provide organic matter that is broken down to form humus
•add air to improve water drainage
•Decompose dead plant and animal matter
•ex: nitrogen-fixing bacteria produce nitrogen that plants need to grow
•ex: some bacteria produce acids that break down rocks, which helps make soil
The activities of organisms affect soil (p. 126)
Read p. 126-127
Properties of soil can be observed & measured (p. 128)
•size of the weathered rock particles
•three categories based on particle size:
•can be red, brown, yellow, green, black, white
•soil color determined by what the soil is made of
Example: Rhizobium is a bacteria that helps make nitrogen available to legumes like peas and beans.
Microscopic view of the bacteria
•loosen and mix soil
•bring rocks to the surface for weathering
This is a page from your book that has drawn a part of an ecosystem and inserted examples of how plants, animals, and microorganisms affect soil
A groundhog chamber...
Read about the
4 properties of soil p. 128-129
texture influences how easily air and water move through soil
This is a soil color chart scientists use to identify different soils. You may want to use colored pencils to draw a few different soil colors in your notes.
Now you will summarize the key information about soil. Remember to include:
- 4 ingredients of soil
- Describe 3 soil horizons
- Explain 4 properties of soil
Read p. 16 about cycles
Read p. 17 about the water cycle
Read p. 18-19 about the carbon cycle
Read p.19-20 about the nitrogen cycle
Review & Connection Words
non renewable resource
In the year 2010, scientists predicted that the world human population would grow to over 7 BILLION by sometime in 2011. This is a video detailing that prediction and why this amount of people is cause for concern.