The Red Power Movement, also known as the American Indian Movement<span> (AIM), was dedicated to getting the Federal Government of the United States to return land that was previously owned by the Native Americans. In 1969 Native Americans tried to regain Alcatraz Island which was once a part of their native territory.</span>
A cliff is a rock exposure with a near vertical (or is vertical) facing. An escarpment is a long cliff, or steep slope. (causes faulting processes)
An acute angle is less than 90 degree ;)
How many do you need? because there is more then one.