Lesson+Quiz+Week+2

=Distance Learning Quiz - Week 2= Below is what you submitted to dl@pisgahforestinstitute.org on Sunday, March 2, 2008 at 20:29:16


 * Topic:** Geology
 * Subtopic:** Mineral ID and Usage, Rock Formation and Cycle, Soil Formation
 * Name:** Kim Collazo
 * E-mail:** kscollazo@gmail.com
 * Question 1:** Man-made diamonds are not considered minerals because minerals are naturally occurring, not synthetic.
 * Question 2 :** Three physical properties, other than color, used to identify minerals are hardness, luster, and breakage pattern.
 * Question 3:** It is not possible for the same mineral to have various chemical formulas. The same mineral must maintain its chemical formula but may have various atomic arrangements and bonding that make unique structures.
 * Question 4:** Minerals are the building blocks of rock. Most rocks are composed of several different types of minerals, although there are some rocks composed of only one type of mineral.
 * Question 5:** The Hawaiian Islands are composed mainly of igneous rock. The islands lie over a hot spot which has delivered molten magma through the weak crust in this area. Since igneous rock is cooled magma, most the island composition is this type.
 * Question 6:** It is possible for sedimentary rock to turn into igneous rock through the rock cycle. As sedimentary rock is plunged back toward the asthenosphere through plate movement and other geological events, it is remelted and "reborn" as igneous rock.
 * Question 7:** Metamorphic rocks are found in areas that have forces exerting a great deal of pressure. This is because metamorphic rock is created when Igneous and Sedimentary rock are heated under pressure and changed chemically and mineralogically. Under layers of younger rock would be a good place to look. Sedimentary rock is most often found near areas that contain fast moving water, or other bodies of water where sediments have been deposited. Another good place to locate Sedimentary rock is near large bodies of water that have evaporated, leaving the cemented sediments. Finally, Igneous rocks are found near volcanic areas where heated magma has come to the surface and cooled.
 * Question 8:** Mechanical weathering occurs during repeated freezing and thawing of water in the cracks of rocks. This is because the rock's composition has not changed as would be the case in chemical weathering.
 * Question 9:** Areas that experience large amounts of rainfall tend to have poor soil quality due to leaching. Leaching is when runoff from rainfall carries many of the nutrients and minerals away from the soil. If this occurs over long periods of time, the soil is left depleted of these valuable substances and its quality is vastly deteriorated.
 * Question 10:** Farmers have begun using a method called conservation-tillage to help reduce the effects of erosion. Conservation-tillage entails either minimum-tillage or no-till farming. The purpose of using these methods is to disturb the soil as little as possible while planting crops. The benefits are that the soil can retain the water it is holding, soil is less likely to pack together leaving the space it needs for air pockets, and it also allows farmers to plant multiple crops.

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