Hurricanes and Avalanches text

What are hurricanes, typhoons, and cyclones collectively known as?

• Earth's mightiest storms

• Tropical rainstorms

• Ocean whirlpools

• Polar vortexes

Where do hurricanes typically form?

• In polar regions

• In deserts

• On mountain tops

• In tropical waters

What is the main cause of hurricanes?

• Cold, dry air

• Low ocean temperatures

• Warm, moist air

• High atmospheric pressure

What is an avalanche also known as when it involves rocks or soil?

• Tsunami

• Landslide

• Earthquake

• Mudslide

What is the most common type of avalanche?

• Rockslide

• Snowslide

• Mudslide

• Ice slide

What triggers a snow avalanche?

• An unstable mass of snow breaking away

• A loud noise

• A sudden increase in temperature

• Heavy rainfall

What are the two main types of snow avalanches?

• Sluffs and Slides

• Slabs and Sheets

• Sluffs and Slabs

• Sheets and Slides

What is a slab avalanche?

• A small slide of dry, powdery snow

• A slide of wet, heavy snow

• A giant block of snow tumbling down

• A slow-moving snowfall

How many avalanches occur in the mountains of the western United States each year?

• About 50,000

• About 10,000

• About 100,000

• About 150,000

What natural event can set off avalanches besides snowfall?

• An earthquake

• A thunderstorm

• A heavy wind

• A volcanic eruption