SNS Grade 7: Chapter 3 - Our Changing Earth

True or False

1. Sea waves are primarily responsible for the formation of glaciers.

• True

• False

True or False

The focus of an earthquake is located on the Earth's surface.

• True

• False

Answer explanation

The focus is located within the Earth's crust, while the epicenter is on the surface.

True or False

An ox-bow lake is formed by wind erosion.

• True

• False

Answer explanation

An ox-bow lake is formed by river erosion and deposition, not by wind.

If a city is located near a plate boundary, what precautions should its government take to minimize earthquake damage?

Answer explanation

To minimize earthquake damage, the government should:

• 1. Build Strong Structures: Use materials and designs that can withstand shaking.

• 2. Prepare People: Conduct regular drills and educate the public on safety measures.

• 3. Early Warning Systems: Create scientific innovations that can alert people before the earthquake hits.

For example, during an earthquake, well-built buildings would sway but not collapse, reducing injuries and deaths.

The process that involves the wearing away of Earth's surface by wind, water, and ice is called _______

The process in which a river creates a winding course due to erosion and deposition is known as _______.

The origin of the seismic energy is called ______________.

Answer explanation

In an earthquake, the seismic waves radiate out in all directions. But it originates or occurs at the focus.

The magnitude of an earthquake is measured on the _______________.

An earthquake is measured with a machine called a _______________.

The highest waterfall is called ___________________.

• Niagara falls

• Victoria Falls

• Angel Falls

• Jog Falls