Plains<span> occur as lowlands along the bottoms of </span>valleys<span> or on the doorsteps of mountains, as coastal </span>plains<span>, and as plateaus or uplands. In a </span>valley<span>, a </span>plain<span> is enclosed on two sides but in other cases a </span>plain<span> may be delineated by a complete or partial ring of hills, by mountains or cliffs.</span>
Their are plates underground and when they move together it causes this
Answer:
Erosion, where the Colorado River would erode through the ground, exposing layers of earth
<u>Answer:</u>
Alluvial fans are evidence that the Death Valley is a tectonically active region.
<u>Explanation:</u>
- Alluvial fans can be only formed by the slow and gradual depositional action of a river.
- But for an alluvial to be formed, it is primarily necessary for the river to continuously carry and deposit sediments for a long period of time.
- The supply of sediments done by the Death Valley in California provides evidence that it is a tectonically active region.
Answer:
A characteristic of the Woodland and Mississippian cultures was the earthen mounds.
Explanation:
The Woodland and Mississippian cultures were the most advanced cultures in what is now the USA. They had well-developed civilizations in comparison to the people groups in their surroundings. Their trademark though was the construction of earthen mounds that are found all over the territories in which the two cultures existed.
The earthen mounds, as the name suggests, are mounds made out of the ground. They vary in size, from just a few meters to hundreds of meters. Their shapes too vary, with some being in a semi-circular shape, some like bulges, while some even like snakes. The purpose of these mounds is still a theme of hot debate, but it is most commonly thought that they had religious purposes.
