earth science help work help please?
1. What is the force behind mass movements?
*the sun's energy
*flowing water
*gravity
*moving ice
2. Which of the following is NOT true about mass movements?
*Some mass movements are too slow to be seen.
*Mass movements always lead to landslides.
*Gravity is the driving force behind all mass movements.
*Mass movements are always downslope.
3. Oversteepened slopes often lead to mass movements because _____. (1 point)
*plants cannot grow on them
*the angle of their slope is between 10 and 20 degrees
*the angle of their slope is less than 20 degrees
the angle of their slope is greater than 40 degrees
4. When a block of material moves downslope along a curved surface, the type of mass movement is called _____.
*a rockfall
*a rockslide
*a slump
*creep
5. A relatively rapid form of mass movement that is most common in dry mountainous regions is _____.
*creep
*a mudflow
*a slump
*an earthflow
6. The average annual precipitation worldwide must equal the quantity of water _____.
*evaporated
*transpired
*infiltrated
*locked in glaciers
7. The ability of a stream to erode and transport materials depends largely on its ______.
*width
*length
*velocity
*density
8. The vertical drop of a stream channel over a certain distance is called _____.
*discharge
*channel roughness
*gradient
*runoff
