Exploring Density and Convection Currents

What determines the density of an object?

• The temperature of the object

• The shape of the object

• The amount of matter in a given space

• The color of the object

Why do objects with more molecules in a space tend to sink?

• They are less dense

• They are warmer

• They are more dense

• They are lighter

In the oil and water demonstration, why does oil float on top of water?

• Oil is heavier than water

• Oil and water have the same density

• Oil is less dense than water

• Oil is more dense than water

What happens to the density of a fluid when it is heated?

• It remains the same

• It becomes less dense

• It becomes more dense

• It becomes solid

Why did the boiling water float on top of the room-temperature water in the demonstration?

• Boiling water is more dense

• Boiling water is heavier

• Boiling water is less dense

• Boiling water is colder

What is required to create a convection current?

• A cold source

• A heat source

• A vacuum

• A magnetic field

In a pot of water on a stove, what happens to the water at the bottom when it is heated?

• It becomes more dense and sinks

• It evaporates immediately

• It becomes less dense and rises

• It remains at the bottom

What causes the water at the top of the pot to sink back down?

• It becomes more dense as it cools

• It becomes less dense as it cools

• It is pushed down by the heat source

• It evaporates and condenses

What is the main reason magma in Earth's mantle rises to the top?

• It is solid

• It is colder

• It is less dense

• It is more dense

What keeps the convection currents in Earth's mantle going?

• The heat from the core

• The rotation of the Earth

• The pressure from the crust

• The gravitational pull