The video explains how erosion, primarily caused by ocean waves and wind, changes the Earth's landscape over time. It discusses the impact of erosion on beaches and rocky cliffs, highlighting how waves carry away sand and rocks, altering the shape of the land. The video also covers methods to prevent erosion, such as building sea walls and implementing building regulations. Finally, it encourages viewers to connect these changes to other natural processes.

What is the main focus of the expository text introduced in the video?

• The formation of mountains

• How ocean waves change beaches over time

• The life cycle of marine animals

• The history of coastal cities

What is erosion?

• The process of building sandcastles

• The wearing away of land by wind and water

• The growth of coral reefs

• The movement of tectonic plates

What can happen to a sandcastle if it is built too close to the water?

• It will be washed away by waves

• It will become stronger

• It will turn into a rock

• It will attract marine life

What is the biggest cause of erosion at the beach?

• Earthquakes

• Ocean waves

• Human activity

• Volcanic eruptions

How do storm waves affect the beach?

• They calm the ocean

• They move a lot of sand quickly

• They create new landforms

• They help plants grow

What can happen to buildings near the ocean due to erosion?

• They can become taller

• They can turn into sand

• They can be washed away

• They can attract tourists

How does erosion affect steep rocky cliffs?

• It makes them more stable

• It turns them into sand dunes

• It causes them to crumble and fall into the sea

• It makes them taller

What is one method local communities use to stop erosion?

• Building sea walls of large boulders

• Constructing more buildings near the shore

• Planting more trees

• Increasing fishing activities

Why do some towns make rules about building on the beach?

• To create more space for parking

• To attract more marine life

• To prevent buildings from washing away

• To increase tourism

How does beach erosion compare to other natural changes?

• It is unrelated to other natural changes

• It is slower than volcanic eruptions

• It is less impactful than earthquakes

• It is similar to other changes caused by wind and water