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Earth Science

E.S. Chapter 5 Section 1-2

weathering The breaking down and changing of rocks at or near Earth's surfaced called __________
mechanical weathering _________ ________ occurs when physical forces break rock into smaller and smaller pieces without changing the rock's mineral composition
9% How much does liquid water expand when it freezes?
frost wedging When water freezes and expands, it enlarges the cracks. After many freeze-thaw cycles, the rock breaks into pieces. This process is called _____ _________
talus Sections of rock that are wedged loose may tumble into large piles called _____
unloading Large masses of rock may be exposed through uplift and erosion of overlaying rocks. When that happens, the pressure exerted on igneous rocks is reduced. This is known as ________.
water What is the most important agent of chemical weathering?
sulfur & nitrogen oxides Water in the atmosphere also absorbs ______ & ________ oxides
regolith Weathering, produces a layer of rock & mineral fragments called _______, which covers nearly all of Earth's land surface
soil texture ____ _______ refers to the proportions of different particle sizes
quickly sandy soils may drain and dry out too _______
difficulty Plants roots often have ________ penetrating soils that often contain a high percentage of clay and silt.
loams _____ are the best for plant growth as they retain water better and store more nutrients.
thicker The longer a soil has been forming, the _______ it becomes
climate What has the greatest effect on soil formation?
plants What is the main source of organic matter in soil?
rapidly Plants that die in tropical rain forest decompose ______ bc bacterial activity is high in hot & wet climates
gullies As more water enters the rills, they erode the soil further, creating trenches called _______
Created by: VickieJ10