silicaExact Matchsilicon dioxideResponse Feedback:The answers are calcium carbonate, iron oxide, and silica (or silicon dioxide). Another cement is clay.Question 34 out of 4 pointsA naturally occurring, inorganic solid with a specific chemical composition and crystalline structure is termed a _____________.Selected Answer:mineralCorrect Answer:mineralAnswer Feedback:Correct!Response Feedback:Mineral -- the correct answer.An element is a unique substance capable of chemical combination with other elements. At the submicroscopic level, an element consists of only onespecies of atoms. Elements (or atoms) form combinations called molecules. Minerals consist of more than one element.
A rock consists of more than one mineral.Question 44 out of 4 pointsA rock mined for its mineral components is called an [x].Selected Answer:oreCorrect Answer:Evaluation MethodCorrect AnswerExact MatchoreAnswer Feedback:Correct!Response Feedback:Correct!Question 5Needs GradingExplain, in terms of a sequence of events, what a porphyritic texture indicates about the history of an igneous rock? Be careful to put the events in the sequence in correct order.Selected Answer:Cooling of the melt is slow allowing crystals to form then the volume is subjected to rapid cooling which prevents crystallization of the remaining melt. This yields a rock with large crystals embedded in a non crystalline matrix.Correct Answer:Cooling of the melt was first slow allowing large crystals to form, and later, thevolume was subjected to rapid cooling which prevented crystallization of the remaining melt, yielding a rock with large crystals embedded in a non-crystalline matrix.Response Feedback:[None Given]Question 6Needs GradingUsing the rock cycle, explain the statement "One rock is the raw material for another." Remember that the rock cycle involves several items. Your answer should mention each of the rock types and how they are transformed into one another.Selected Answer:Rocks on Earth's surface are subject to erosion. These rocks yield grains that form new sedimentary rocks. Rocks that are subject to high temperature and pressure metamorphosized, forming metamorphic rocks. Rocks subject to extremely high temperature can be melted and when cooled for igneous rocks.
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- Spring '14
- Correct Answer, Detrital sedimentary