9.1 How Forces in Nature Affect us

Which of the following is not an example of natural disaster?

• droughts

• floods

• nuclear blast

• cyclone

An increased in sea surface _ _ _ _ _ _ _ _ _ _ _ leads to the formation of intense storm known as tropical cyclones.

Which of the following is not caused by tropical cyclones, accompanied by heavy rain and strong wind?

• flooding

• earthquakes

• landslides

• flying objects

Explain how force can generate earthquakes.

Answer explanation

When a plate slides over or against another plate, the force exerted between the two plates may result in a great amount of energy released.

Powerful waves hit the shore and strike objects along the shore with great force resulting in erosion of coastlines.

• True

• False

How forces can be generated in volcanic eruptions?

Answer explanation

Magma deep inside Earth is pushed out towards Earth’s surface with great force causing the Earth to move violently

As water move at high speed towards the shore, the potential energy is mainly converted to ___ energy

• sound

• gravitational potential

• kinetic

• electrical

How forces can be generated in tsunami?

Answer explanation

Vigorous movement of the ocean floor caused by earthquakes or volcanic eruptions displaces the ocean water and results in tsunamis

Forces in nature can also shape the _ _ _ _ _ _ _ _ environment and give rise to beautiful landforms.

Which of the following is not caused by forces of harsh winds and ocean waves?

• arches

• caves

• pillars

• lake