Chapter 6: The Water Cycle and Weather

How much of Earth's surface is covered with water?

• 3/4
• 1/3
• 1/4
• 2/4

What is the difference between ocean water and fresh water?

• Ocean water is warmer than fresh water
• Fresh water has dissolved minerals, and oceans do not.
• Oceans are salty, and fresh water is not.
• Fresh water is full of sodium chloride, and ocean are not.

How is air at the top of a mountain different from air at the base of the mountain?

• Air at the top of the mountain is denser.
• Air pressure is lower at the top of the mountain.
• Air pressure is higher at the top of the mountain.
• Air at the top of the mountain contains more mass.

Why is the Baltic Sea less salty than other seas?

• Deserts surround the Baltic Sea.
• The Baltic Sea is in a warm place.
• Many rivers flow into the Baltic Sea.
• Water travels very quickly through the Baltic Sea.

What is the Sun's role in the water cycle?

• Water evaporates in the Sun's warmth.
• The Sun makes water particles slow down.
• Water condenses when it is warmed by the the Sun.
• The Sun's warmth changes water from a gas to a liquid.

What happens when moist air rises?

• The moist air warms, and water evaporates from the Sun.
• The moist air is able to store even more water as it rises.
• The moist air cools and is able to store more precipitation.
• The moist air cools, and the water vapor condenses into clouds.

What is condensation?

• rain becoming ice as it cools
• ice becoming liquid water as it warms
• rain becoming water vapor as it warms
• water vapor becoming liquid water as it cools

What do curving lines on a weather map show?

• fronts and how they are moving
• areas where low pressure systems are
• areas where high pressure systems are
• areas where high and low temperatures are

What best describes air?

• a force that presses gases toward Earth's surface
• a substance with no mass that contains water vapor
• a force that surrounds Earth
• the gases that surround Earth's surface

What happens to air when there is an area of lower pressure nearby?

• Air that was moving comes to a standstill.
• The water vapor in the air becomes less dense.
• The air moves toward the area of low pressure.
• The particles of air become more loosely packed.