ESS2.2 - Convection Patterns

Convection patterns are formed due to the uneven heating of the earth because:

• the earth's surface absorbs heat evenly.

• the earth's surface absorbs heat unevenly, causing air to move.

• the earth's surface does not absorb heat.

• the earth's surface reflects all heat.

Convection is a process that causes fluids like air and water to move due to:

• temperature differences

• pressure differences

• chemical reactions

• magnetic fields

Warmer parts of a fluid rise and cooler, denser parts sink because:

• warmer fluid is less dense and rises while cooler fluid is denser and sinks

• warmer fluid is denser and sinks while cooler fluid is less dense and rises

• temperature has no effect on fluid movement

• fluids do not move based on temperature differences

Convection currents are formed in a pot of boiling water when:

• the water at the bottom heats up, becomes less dense, and rises, while cooler water descends to take its place.

• the water at the top heats up, becomes more dense, and sinks, while cooler water rises to take its place.

• the water at the bottom cools down, becomes more dense, and rises, while warmer water descends to take its place.

• the water at the top cools down, becomes less dense, and rises, while warmer water descends to take its place.

What does the sun do to the Earth according to the fact list?

• Heats the Earth evenly

• Heats the Earth unevenly

• Cools the Earth

• Cools the Earth unevenly

Fill in the blank: Warm air near the surface rises due to ________ density.

• lower

• higher

• equal

• constant

What happens to cooler air from higher altitudes?

• It rises to the surface

• It moves down to replace warm air

• It stays at high altitudes

• It heats up

What does the cycle of warm air rising and cool air sinking create?

• Earthquakes

• Ocean currents

• Wind patterns and weather systems

• Mountain ranges

What is the main difference between convection and conduction?

• Convection involves direct contact, while conduction involves fluid movement.

• Convection involves fluid movement due to temperature changes, while conduction is heat transfer through direct contact.

• Convection and conduction both involve fluid movement.

Convection is all about moving fluids, like air or water, while conduction is about _________.

• touching, like a warm spoon in hot soup.

• mixing, like stirring sugar in tea.

• evaporating, like water turning into steam.

• radiating, like heat from the sun.