science chapter 2 essay questions 6thgrade

question

how do plants cause mechanical weathering?
answer

plants cause mechanical weathering when the roots crack the rock underneath it. first the roots of the plants enter the cracks in the rock, then the roots force the rock further away splitting the rock in half or in pieces. overtime the cracks become bigger and bigger and the rock splits into more and more smaller pieces…
question

how does contour plowing conserve soil?
answer

contour plowing conserves soil b/c when the farmer plows his fields using contour plowing the farmer plows his fields on the curve of a slope. this helps slow the runoff of excess rainfall and prevents it from washing away the soil…
question

a gardener digs up soil while planting a garden in the spring, she picks out every earthworm she can find and throws it in the trash. is the gardener helping or hurting her chances for a healthy garden? explain.
answer

it will hurt her chances of a healthy garden b/c worms decompose dead organic material and mix it with the soil. because the dead organic material turns into nurturance. so yes she is…
question

which combination of factors could cause another Dust Bowl in the future?
answer

some combination of factors that could cause another Dust Bowl in the future are a drought, high wind, and farmers using soil over and over again in the same year and season…
question

which would weather faster, expose limestone in the southern Florida or granite in north Carolina? explain your reasoning.
answer

Limestone in southern Florida, b/c carbonic acid would make it weather faster. Another gas found in air, carbon dioxide, also causes chemical weathering…

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