Natural Hazard Prediction Mod L Unit 1 Lesson 2

Mauna Loa erupted on average once every four years between 1832 and 1984. From 1870 to 1880, the number of eruptions was ________ than average. Beginning in 1940, eruptions were _________ frequent than average. (P34)

• greater, less

• less, greater

• greater, more

• less, more

Answer explanation

Between 1870 and 1880, eruptions happened nearly every year. After 1940 eruptions happened every 9 to 25 years.

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The graphs show that Mauna Loa’s crater _________ and the number of earthquakes ____________. (P35)

• shrank, increased

• shrank, decreased

• expanded, decreased

• expanded, increaced

Answer explanation

The graphs show that Mauna Loa's crater has expanded and earthquake activity increased around the same time.

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P36. The probability of a magnitude 7.0 earthquake happening in Bozeman, Montana in

the next 100 years is

Answer explanation

On the probability map of a 7.0 earthquake in the next 100 years, Borzeman, Montana, is in the gray area, which indicates the probability of a 7.0 earthquake happening there is 1%-10%.

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Look at the map and the photo (P37).

We know where tornado risk is high, but do you think we can prevent tornadoes from causing damage and injury? Explain.

Answer explanation

It helps to know where tornado risk is high so people can have evacuation plans and build shelters. However, knowing the risk does not tell us exactly when or where future tornadoes will happen and we cannot prevent tornadoes from damaging structures.

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This armored vehicle is designed to be driven into a tornado to gather important weather data.

What types of data do you think this and other machines could collect by entering a tornado?

Answer explanation

Types of information that could be collected are: air temperature, speed and wind direction. This information could help scientists better understand the conditions that are needed to start and sustain a tornado.

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P39. The tornado data on this map show a pattern. In the northernmost states where tornadoes occur, most tornadoes occur in the _______. In the southeastern United States, most tornadoes occur in the ___________.

• fall, summer

• winter, fall

• summer, fal

• fall, winter

Answer explanation

The map show is that more summer tornadoes occur in the northern states. In the southeastern states, more tornadoes occur in the fall.

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These historical data show that tornadoes are least likely to occur in North Carolina in ___________.

Answer explanation

The graph show that between 1950 and 2015, the fewest number of tornadoes occurred during the month of December.

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Discuss How did the information available in the weather forecasts change in the days leading up to April 16th? Do you think these forecasts gave people enough

time to prepare for the tornadoes? Explain.

Answer explanation

The information became more specific leading up to the 16th. On the 15th, the forecast mentioned that tornadoes were ikely. This could have allowed some people to evacuate or prepare their homes and property. Some people may not have heard the forecast or many not have had a way to evacuate or prepare.

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The most widespread cause of flooding in the world is ________. The type of flooding that mainly affects only the Northern Hemisphere is ______________. The region most affected by monsoonal rains is _________. (P41)

Answer explanation

Different regions of the world have different causes of flooding. Some causes, such as heavy rains, are common around the world, while others are isolated to certain areas.

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