During the Mesozoic Era, where did most of the orogenic activity occur on the North American continent? What will be an ideal response?
In contrast to the Paleozoic Era, most of the orogenic activity in the Mesozoic Era occurred
on the western margin of the North American craton. This included the Sonoma, Nevadan,
Sevier, and Laramide orogenies
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The source of ________ bacteria is typically animal fecal waste
Fill in the blank(s) with correct word
In terms of human-environment interaction, which of the following is an example of an anthropogenic endogenic process contributing to the geologic cycle?
A) Rock removal for building contributing to land slides. B) Strip mining. C) Injection wells contributing to earthquake activity. D) Harnessing geothermal energy for electricity development.
The mineral fluorite is commonly sold in mineral shops as octahedral (8-sided) objects. This shape originates from ________
A) the growth of fluorite in caves and is the form the crystals grow in the open cavern B) cutting a larger crystal along four perfect cleavage planes, forming a cleavage fragment C) the typical crystal form of fluorite D) a pseudomorph (false form) of fluorite from replacement of a salt, potassium chlorite, that grows in octahedral crystals
Light colored silicates have a specific gravity of about 2.7 grams/cm3 are composed primarily of the silica tetrahedra and ________
A) potassium, aluminum, magnesium, and sodium B) potassium, calcium, sodium, and aluminum C) magnesium, aluminum, sodium, and calcium D) iron, magnesium, calcium, and sodium E) aluminum, magnesium, calcium, and iron