Exploring Density in Earth Formation

The video tutorial explains the concept of density as the ratio of mass to volume, using examples like gold and quartz to illustrate how density varies with mass and volume. It discusses how density can determine the purity of gold and explores natural phenomena like ocean currents and atmospheric changes due to density variations. The tutorial also covers convection in Earth's layers and offers a practical test to measure personal density.

What is the ratio of an object's mass to its volume called?

• Weight

• Density

• Volume

• Mass

To increase the density of an object, you can:

• Decrease its volume

• Increase its mass

• Decrease its mass

• Increase its volume

If two objects have the same volume but different masses, which one is denser?

• They have the same density

• Density cannot be determined

• The one with the larger mass

• The one with the smaller mass

Which material is denser: a gold nugget or a quartz crystal of the same volume?

• Density cannot be determined

• They have the same density

• Gold nugget

• Quartz crystal

How can you determine if a gold sample is pure?

• By comparing its weight to the weight of an equal volume of water

• By comparing its weight to the weight of twenty times its volume in water

• By measuring its volume

• By checking its color

What happens to water when it cools and contracts?

• It becomes less dense and rises

• It becomes denser and sinks

• It stays the same density

• It evaporates

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What causes air to rise in the atmosphere?

• It cools down

• It loses water vapor

• It becomes less dense

• It becomes denser

What is the main cause of plate tectonics?

• Earthquakes

• Convection in the asthenosphere

• Tidal forces

• Volcanic eruptions

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What happens to the plastic or liquid material in the asthenosphere when it heats up?

• It contracts and becomes denser

• It expands and becomes less dense

• It stays the same density

• It solidifies

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What is the term for the transfer of heat in a plastic or liquid medium?

• Conduction

• Radiation

• Convection

• Diffusion

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