physics review

Melting Solids: Why do solids melt when they are heated more?

• The particles start to shrink

• The attractive forces between the particles become stronger

• The particles vibrate so much that the attractive forces are not strong enough to hold them in a fixed pattern

• The particles lose all their energy

Boiling Liquid: What happens to some particles in a liquid when it is heated to the boiling point?

• They become solid

• They move closer together and vibrate less

• They break the weak attractive forces and escape as gas particles

• They stop moving

Why is it difficult for a solid to become smaller?

Explain why a solid cannot flow.

What are the places where tectonic plates meet called?

• Fault lines

• Earthquakes

• Volcanoes

• Mountains

What are the edges of tectonic plates called?

• Fault lines

• Plateaus

• Plate boundaries

• Rift zones

Why does geological change often occur at plate boundaries?

• Because they are the hottest parts of the Earth's crust

• Because the Earth's magnetic field is weakest there

• Because the plates are in constant motion and interact with each other

• Because they are the highest points on Earth

A guitar is a musical instrument with strings. Which one of these is needed to make a sound from the guitar?

Zara is playing the guitar by plucking a string. Which statement describes a way that Zara can make the sound louder?

• Pluck the string with more force.

• Pluck the string with less force.

• Make the string tighter.

• Make the string looser.

What do bats use echoes for?

• To communicate with each other

• To find insects for food