A Weathering and Soil Formation 228 Unit 2: Earth’s Surface Natural forces break rocks apart and form soil, which supports life. Key Concepts Mechanical and chemical forces break down rocks. Learn about the natural forces that break down rocks. Weathering and organ- ic processes form soil. Learn about the formation and properties of soil. Human activities affect soil. Learn how land use affects soil and how soil can be protected and conserved. 3 SECTION 2 SECTION 1 SECTION How is rock related to soil? Prepare and practice for the FCAT • Section Reviews, pp. 236, 245, 252 • Chapter Review, pp. 254–256 • FCAT Practice, p. 257 CLASSZONE.COM • Florida Review: Content Review and FCAT Practice
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A
Weathering andSoil Formation
228 Unit 2: Earth’s Surface
Natural forces breakrocks apart and formsoil, which supports life.
Key Concepts
Mechanical andchemical forces breakdown rocks.Learn about the natural forcesthat break down rocks.
Weathering and organ-ic processes form soil.Learn about the formationand properties of soil.
Human activities affect soil.Learn how land use affectssoil and how soil can be protected and conserved.
3SECTION
2SECTION
1SECTION
How is rockrelated to soil?
Prepare and practice for the FCAT
• Section Reviews, pp. 236, 245, 252
• Chapter Review, pp. 254–256• FCAT Practice, p. 257
Ice PowerFill a plastic container to the top with waterand seal the lid tightly. Place it in the freezerovernight. Check onyour container thenext morning.
Observe and Think What happened to the container? Why?
Internet Activity: Soil FormationGo to ClassZone.com to watch how soil forms. Learn how materials break down and contribute to soil buildup over time.
Observe and ThinkWhat do rocks and soilhave in common? Whatdo organic matter andsoil have in common?
NSTA scilinks.org
Soil Conservation Code: MDL016
Getting the Dirt on SoilRemove the top and bottom of a tin can. Be careful of sharp edges.Measure and mark 2 cm from oneend of the can. Insert the can 2 cminto the ground, up to the mark.Fill the can with water and timehow long it takes for the canto drain. Repeat the proce-dure in a different location.
Observe and ThinkWhat do you think affectshow long it takes for soilto absorb water?
To take notes about a new concept, first make an informal outline of theinformation. Then make asketch of the concept andlabel it so that you canstudy it later.
VOCABULARYSTRATEGY
Place each vocabularyterm at the center of adescription wheel. On thespokes write some wordsexplaining it.
CONCEPT REVIEW
• The atmosphere, hydrosphere,biosphere, and geosphereinteract to shape Earth’s surface.
• Natural processes form,change, break down, and re-form rocks.