DO Now1. _____ layer that satellites orbit (atm

layers)2. _____ most abundant gas in the

atmosphere (atmosphere)3. _____changes from water vapor to a

liquid (water cycle)4. _____ where most water is evaporated

from (water cycle2)5. _____ rise in the global temperature due

to an increase in carbon dioxide (water cycle 2)

1. What is a cloud?2. How do clouds form?3. What is a cumulus cloud?4. What is a stratus cloud?5. What is a cirrus cloud?6. What is cloud seeding?

Chapter 16, Section 1 Continued

Clouds• 1. Cloud-a collection of millions of tiny

water droplets or ice crystals.• 2. Clouds form from condensation when

water evaporates and water vapor in the air cools on dust or dirt and becomes liquid water or ice.

3. Cumulus Clouds• Puffy and white • flat bottoms• Form when warm air rises• Indicate fair weather• When these clouds get larger they

produce thunderstorms and are called cumulonimbus.

• Form in layers• Cover large areas of the sky• Often block the sun• Formed by a gentle lifting of a large body of air

into the atmosphere.• Fog is an example of a stratus cloud

4. Stratus Clouds

• Thin feathery white clouds• Made of ice crystals • found in high altitudes.• form when the wind is strong.• May indicate approaching bad weather if

they thicken and lower in altitude.

5. Cirrus Clouds

6. Cloud Seeding

• Cloud seeding is the process of spreading either dry ice or aerosols, into the upper part of clouds to form rain.

Types of Clouds

• Clouds are also classified by altitude.

Up to 2000m

stratus nimbostratus Stratocumulus

Up to 4000m

cumulus Altocumulus

Up to 6000m

altostratus Cumulonimbus

Up to 8000m

cirrocumulus cirrostratus Cirrus