Student Sheet 7.1b

Storms Review

Directions: Review the reading selections in your Student Guide, your notes, and your student

sheets to prepare for this assessment. Ask your teacher whether you will be allowed to use those

materials during the assessment.

The assessment for Storms will be divided into Parts A and B.

Part A. In this part of your assessment, you will observe an investigation. Your teacher will set up

and work with science equipment to demonstrate science concepts you have investigated in this

part of the module. You will be asked to describe what you see and tell why it is happening. You will

be graded on your ability to record your observations and to apply what you are seeing to real-world

storms.

Answer these questions to study for Part A:

1. What is a vortex, and what causes it to form?

A vortex is the movement of a gas or liquid in a spiral motion. A vortex can be formed by the uneven heating of the earth's surfaces, the earth's rotation, and gravity.

2. How does air above a heated surface move?

It rises.

3. How does air above a cold surface move?

It sinks.

4. What happens when hot air meets cold air?

When hot and cold air meet, a vortex will form.

5. How do hurricanes form?

Hurricanes form from warm ,moist air rising over tropical waters.

Student Sheet 7.1b (continued)

Part B. In Part B of the assessment, you will be asked 20 questions. Most of the questions will be

multiple-choice. Three will be short-answer questions.

To study for Part B, answer these questions:

1. How are hurricanes and tornadoes alike? (Look at the Venn diagram in which you compared

thunderstorms, tornadoes, and hurricanes.)

Hurricanes and tornadoes are alike because they  both have spiraling winds.

How are they different?

Hurricanes and tornadoes are different because tornadoes form over land, and hurricanes form over tropical waters. Also, a hurricane is much bigger in diameter than a tornado.

2. What role does the sun play in the weather on the earth?

The sun is the main source of heat energy on earth. This creates wind, rain, and other elements of weather.

3. What is a convection current?

A convection current is the circulation of heat through a liquid or gas resulting from differences in temperature. (Warm air rises, and cool air sinks.)

4. Think about the investigation in Lesson 3 when you heated soil and water. Then answer the

following questions:

A. How did you set up your investigation to make it a fair test?

We set up the water and soil the same distance from the lamp. We also used the same amount of material in the beakers. We timed the items for the same amount of time.

B. Which heated faster: soil or water?    Soil

C. Which held its heat longer: soil or water?    Water

Student Sheet 7.1b (continued)

5. Look at your graph from Lesson 3.  

A. What does the soil curve look like? Why?

The soil curve rises and then sinks quickly like a hill or mountain. It does this because soil heats quickly and then cools quickly.

B. What does the water curve look like? Why?

The water curve rises only a little and then flattens. This is because water heats slowly and then cools slowly, so it hold its heat longer.

C. What was the temperature of your soil after 5 minutes of heating?

Around 25 degrees Celcius. (Just be able to read a graph on the test. You don't have to memorize this number.)

6. Study the illustration of Tornado Alley on page 65. Answer the following:

A. What states make up Tornado Alley?

Kansas, Missouri, Texas, Oklahoma

B. What causes tornadoes to form in Tornado Alley?

Cold, dry air masses from Canada meet warm, moist air masses from the Gulf of Mexico in Tornado Alley.

7. Take another look at the illustration of a sea breeze and a land breeze on page 59.

What is a sea breeze, and when does it form?

A sea breeze is the flow of air from a body of water to the land. It form during the day.

8. Look at the illustration of the water cycle on page 72. Describe the water cycle and how clouds form.

Water evaporates, and the warm air rises. As water vapor rises into cooler altitudes, it cools and condenses. It sticks to dust particles in the atmosphere and forms clouds.

Student Sheet 7.1b (continued)

9. Look at the weather maps on page 70.

A. Where is the pressure high? What is the weather like there?

Anywhere you see a high pressure symbol. The weather is clear and sunny there.

B. Where is the pressure low? What is the weather like there?

Anywhere you see a low pressure symbol. The weather is cloudy and possibly rainy or stormy there.

C. Find a front. Where is it? What is the weather like there?

This symbol is for a cold front. The weather along this type of front is stormy.

This symbol is for a warm front. The weather along a warm front is just rainy.

D. In what direction is the weather moving across the United States ? How can this help

meteorologists?

Weather moves from the west to the east in the U.S. because the jet stream carries air from west to east. This can help meteorologists because they know that weather in the west will be traveling east. This helps them to be able to predict the weather.

10. Think about the investigation in Lesson 7 in which you modeled ocean currents.

A. How do some deep ocean currents form?

They form from convection currents that form in the ocean.

B. How do winds affect ocean water?

Winds can create surface currents that flow in the same direction as the winds that power them.

C. How do ocean currents affect air temperatures around the world?

Ocean currents can bring either warm or cold air with them. (If it is a warm current, it will bring warmer air with it. If it is a cold current, it will bring cooler air with it.)