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When wind and dry soil meet, dust sweeps across the land. This combination happened on a (a)   scale during the 1930s in the United States. From 1931 to 1939 little or no rain fell across the Great Plains. The Dust and erosion created a "Dust Bowl" across more than 50 million acres of farmland in states that included New Mexico, Kansas, Texas, and Oklahoma. MASS

With no rain, little soil, and (a)   air, farmers started losing their crops and money. There was nothing they could do.DUST

This is why they felt absolutely (a)   . To escape the dust storms, which became known as "black blizzards", many of them moved from the Great Plains to farms in California. It is estimated that 2.5 million people left the Great Plains during this period.HELP

They hoped to begin again, but most found poor living conditions and little aid. Many cities tried to keep them out; few people and (a)   helped them resettle. ORGANISE

The displaced had nowhere to turn and couldn't go back. It was obvious that the federal (a)   had to step in and assist the millions of people devastated by the Dust Bowl, as well as repair the unprecedented environmental problems. GOVERN

People have been trying to predict the weather for thousands of years. In ancient times, they closely observed and remembered changes in clouds, wind and temperature that occurred just before (a)   weather events like hailstorms or floods.USUAL

Today, forecasting the weather combines data collection with the old skill of pattern recognition. (a)   called meteorologists collect data using all sorts of tools and gadgets.SCIENCE

Then they analyze and interpret the collected data with the help of (a)   and compare it to their knowledge and experience. This process allows meteorologists to make predictions about the weather days and even weeks in advance.COMPUTE

Forensic meteorologists are called upon to research past weather events for court cases and insurance claims. Meteorologists often have a good background in subjects such as physics, astronomy, and math. It also helps if you like (a)   kinds of weather and if you are observant and curious!VARY

The growth of tourism infrastructure related to the base of Ayers Rock, or Uluru began in the 1950s. Soon it started to produce adverse (a)   impacts.ENVIRONMENT