Discuss the process of glacial erosion
What will be an ideal response?
A flowing glacier mechanically picks up rock material and carries it downslope in a process called glacial plucking. Some debris is also carried englacially (internally within the glacier). When the glacier retreats, it may leave behind rock material that it carried from elsewhere. These deposits are called glacial erratics. The rock pieces frozen to the basal layers of the glacier enable the ice mass to scour the landscape as it passes over it, in a process called abrasion. This produces a smooth surface that shines with so-called glacial polish as the glacier retreats.
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Which of the following would be a good cap rock for oil and natural gas deposits?
A) Shale B) Sandstone C) Limestone D) Conglomerate
As loess erodes, it ________
A) forms bluffs B) weathers to a darker color C) forms floodplains D) weathers to gravel size E) can be deposited to make sand dunes
Which of the following is generally true of all anions?
A) An anion has equal numbers of protons and electrons. B) An anion has fewer protons than electrons. C) An anion has more protons than electrons. D) An anion has more electrons than neutrons.
The chemical composition of a mineral must be:
a. fixed b. variable within fixed limits c. variable d. either a or b