Satellite images

Which of the following best describes how mountains change over time?

• The elevation of the peaks will decrease due to erosion.

• The elevation of the peaks will increase due to weathering.

• The elevation of the peaks will increase due to deposition.

• Mountains stay the same, they never change.

The satellite image below shows a portion of the Namib Desert in Africa. This is an ancient, sandy desert with dunes that can be up to 305 m tall. The Namib Desert extends inland from the Atlantic Ocean between 80 km and 200 km and receives only 5 mm to 76 mm of rain each year.

A satellite picture of this same area taken weeks before shows that the shape and location of some sand dunes have changed. Which of these most likely caused the changes in the dunes?

• Ocean waves

• Flowing rivers

• Blowing wind

• Crustal uplift

Based on the map below, which location has a greater elevation, A or B?

• Location A is higher.
• Location B is higher.
• Locations A and B are at the same elevation.
• It is impossible to determine which location is higher.

What would be the most likely way this coastline would change over time?

• A fire could destroy the vegetation
• The waves could erode the beach
• The beach would grow due to deposition
• The beach will disappear due to plate tectonics

How would expect this feature to change over time?

• The crater will continue to deepen as water erodes the rim.

• The crater will fill as wind deposits sediments inside the crater.

• The crater will continue to deepen as wind weathers the rocks inside the crater.

• The crater will fill as water weathers the sediments outside the crater.

What is this feature, and what process created it?

• canyon, erosion

• canyon; deposition

• delta; weathering

• delta; deposition