What are the types of mass movement?
What will be an ideal response?
Answer: Mass movement is the downslope movement of rock and soil at Earth's surface, driven mainly by the force of gravity acting on those materials. Some mass movements are very common and gradual, while others are rare and sudden.
Soil creep is the most common form of mass movement. It is a very slow, gradual movement of material down the slope of a hill. A tiny movement, such as an insect pushing soil aside, can cause creep. Creep occurs near the surface, in the top 3 to 10 feet of soil. Even though creep is very slow and usually unnoticed, it is relatively steady and can move a substantial amount of material downslope over time.
Some mass movements can also be rare and sudden. These tends to be a more dangerous and dramatic form of mass movements. Landslides and mudflows, examples of this type of mass movement, can occur on steep slopes, especially during wet conditions. In landslides, a relatively intact mass of rock or soil slides over the surface below. Landslides follow intense rains, because material with a high water content is weaker and less able to resist the force of gravity. On the other hand, if the slide occurs in weathered rock and soil, it tends to break down into a thick fluid as it moves downhill, becoming a mudflow.
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About what percentage of the U.S. and Canadian population lives in poverty?
A) 2%-3% B) 13%-16% C) 19%-23% D) 7%-9% E) 24%-26%
Match the following items with the correct descriptions
A) a dip-slip fault where the hanging wall moves up relative to the footwall block B) valley formed from the downward displacement of a normal fault-bounded block C) a fault where the dominant displacement is horizontal and parallel to the strike of the fault surface D) a fault where the movement is parallel to the dip of the fault E) a low-angle (less than 45 degrees) reverse fault F) an elongated, uplifted block of crust bounded by normal faults G) vertical displacements along dip—slip faults that may produce long, low cliffs H) a dip-slip fault where the hanging wall moves down relative to the footwall block 1) fault scarp 2) horst 3) graben 4) normal fault 5) reverse fault 6) strike-slip fault 7) dip-slip fault 8) thrust fault
Salvador, Brazil is located at 13° S (and at an elevation of 9 m). Based on its latitudinal position, which of the following likely best describes its temperature?
A) Seasonal variations of temperature are most pronounced in the summer. B) Summers are exceptionally hot, but winters are typically quite mild. C) Cool and mild temperatures predominate throughout the year. D) Temperatures can range from -10°C (14°F) in the winter to 21°C (70°F) in the summer. E) The temperature is consistently high throughout the year.
The formation of acetone from acetoacetate is an example of which of the following type of reaction?
A) decarboxylation B) hydrolysis C) reduction D) oxidation