THIS IS With Your Host... AWater on Earth BWeather Tools C- Water Cycle DAir Masses ETeacher’s Choice 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500 How much of Earth’s surface is water? A- 1/3 B- 1/2 C- 3/4 D- 7/8 A 100 How much of Earth’s surface is water? C- 3/4 A 100 How are ocean water and fresh water different? A- Oceans are warmer than freshwater. B- Ocean water is salty and fresh water is not. C- Freshwater has minerals in it and ocean water does not. A 200 How are ocean water and fresh water different? B- Ocean water is salty and fresh water is not. A 200 Why is the Baltic Sea less salty than other seas? A- Water travels quickly through the Baltic Sea. B- Deserts surround the Baltic Sea. C- The Baltic Sea is in a warm place. D- Many rivers flow into the Baltic Sea. A 300 Why is the Baltic Sea less salty than other seas? D- Many rivers flow into the Baltic Sea. A 300 What fraction of Earth’s water is usable fresh water? A- ¾ B- 97/100 C- 2/100 D- 1/100 A 400 What fraction of Earth’s water is usable fresh water? D- 1/100 A 400 Where does the salt found in oceans come from? A- the salt shaker B- material dissolved from rocks and soils C- oceans D- evaporating salt water A 500 Where does the salt found in oceans come from? B- material dissolved from rocks and soils A 500 What can you use to measure wind speed? A- barometer B- thermometer C- wind vane D- anemometer B 100 What can you use to measure wind speed? D- anemometer B 100 Which of these will measure air pressure? A- humidity B- anemometer C- barometer D- thermometer B 200 Which of these will measure air pressure? C- barometer B 200 What tool can measure wind direction? A – wind vane B- anemometer C- thermometer D- barometer B 300 What tool can measure wind direction? A – wind vane B 300 DAILY DOUBLE What might happen if Earth’s average temperature increases by a few degrees? A- We will enter an ice age. B- The polar ice caps might melt. C- There will be more salt water. D- There will be more fossil fuels. B 400 What might happen if Earth’s average temperature increases by a few degrees? B- The polar ice caps might melt. B 400 What do curved lines on a weather map represent? A- areas with hills B- areas with clouds C- areas with similar air pressure D- areas with thunderstorms B 500 What do curved lines on a weather map represent? C- areas with similar air pressure B 500 What is the Sun’s role in the energy cycle? A- Water evaporates in the Sun’s warmth. B- The sun makes water particles slow down. C- The Sun’s warmth changes water from a gas to a liquid. C 100 What is the Sun’s role in the energy cycle? A- Water evaporates in the Sun’s warmth. C 100 What is condensation? A- rain becoming water vapor when it warms B- ice becoming liquid as it warms C- water vapor becoming liquid water as it cools D- rain becoming ice when it cools C 200 What is condensation? C- water vapor becoming liquid water as it cools C 200 How will air at the top of a mountain be different than air at the base of the mountain? A- Air pressure will be lower at the top. B- Air pressure will be higher at the top. C- Air at the top will be denser. D- Air at the top will contain less mass. C 300 How will air at the top of a mountain be different than air at the base of the mountain? A- Air pressure will be lower at the top. C 300 Which best describes the water cycle? A- the movement of water between land and water B- the movement of water between Earth’s surface and the atmosphere C- the movement of clouds in the atmosphere C 400 Which best describes the water cycle? B- the movement of water between Earth’s surface and the atmosphere C 400 What is the stage of the water cycle when water sinks into the soil and underground pores in rocks? A- evaporation B- condensation C- precipitation D- storage C 500 What is the stage of the water cycle when water sinks into the soil and underground pores in rocks? D- storage C 500 What happens when moist air rises? A- The moist air warms and water evaporates from the air. B- The moist air cools and is able to store more precipitation. C- The moist air cools and the water vapor condenses into clouds. D 100 What happens when moist air rises? C- The moist air cools and the water vapor condenses into clouds. D 100 DAILY DOUBLE What do the curving lines on this chart show? A- areas with the same air pressure B- areas of low pressure C- areas of low and high temperatures D 200 What do the curving lines on this chart show? A- areas with the same air pressure D 200 Which best describes air? A- a force that presses gases toward Earth’s surface B- a substance that surrounds Earth and takes up space C- a substance with no mass that contains water vapor D 300 Which best describes air? B- a substance that surrounds Earth and takes up space D 300 How will the air at the top of the mountain be different from the air at the base of the mountain? A- Air at the top will be denser. B- Air pressure will be higher at the top. C- Air pressure will be lower at the top. D 400 How will the air at the top of the mountain be different from the air at the base of the mountain? C- Air pressure will be lower at the top. D 400 What happens when air hits an area of lower pressure? A- The air moves toward the area of lower pressure. B- Air that was moving comes to a standstill. C- The particles in the air become more loosely packed. D 500 What happens when air hits an area of lower pressure? A- The air moves toward the area of lower pressure. D 500 What is humidity? A- the amount of water in the air B- air pressure C- how strong the wind is D- whether air pressure is rising or falling E 100 What is humidity? A- the amount of water in the air E 100 Which best describes stratus clouds? A- low-lying white clouds B- clouds high in the sky C- high, white and puffy clouds that may appear in good weather D- clouds close to the ground that often bring rain or snow E 200 Which best describes stratus clouds? D- clouds close to the ground that often bring rain or snow E 200 Why do you often see clouds along a cold front? A- Cold air makes the clouds visible. B- Cold air moves the warm air to form clouds. C- Clouds are left from the warm front. D- Water vapor in the cooling air turns into clouds. E 300 Why do you often see clouds along a cold front? D- Water vapor in the cooling air turns into clouds. E 300 What can scientists look at to study past climates? A- tree rings B- Earth’s crust C- ice core samples D- all of the above E 400 What can scientists look at to study past climates? A- tree rings B- Earth’s crust C- ice core samples D- all of the above E 400 What happens when a cold air mass meets a warm air mass that is not moving? A- It creates a cold front. B- It creates a warm front. C- It causes evaporation. D- The water cycle. E 500 What happens when a cold air mass meets a warm air mass that is not moving? A- It creates a cold front. E 500