Satellite images

A satellite image of an area in Florida shows a river with slight bends along its length. A second satellite image taken of the same area 10 years later shows the same river with  a different course. What is the best explanation for the difference in the shape of the river's course between the two satellite images?

• Wind blew waves across the water surface, eroding away the bank on one side of the river until the river's course changed its shape
• Regular freezing and thawing of the river split the soil along the river banks, changing the shape of the river
• Water eroded the banks of the river and deposited the eroded soil on opposite banks, causing the river to form tighter bends
• Acid rain chemically weathered the banks along the river, forcing the river to wind back and forth

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

Deltas forming at the mouths of rivers would be an example of...

• Weathering
• Erosion
• Deposition
• Preposition

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 305m tall. The Namib Desert extends inland from the Atlantic Ocean between 80 km and 200km and receives only 5 mm to 76mm 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