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The table below shows the salmon population, in thousands of pounds, in Columbia River, from 1870 to 1950. Year Salmon population (in thousands of pounds) 1870 10,200 1890 20,000 1915 20,500 1931 30,000 1950 10,000 Based on the table, which of these is most likely the period during which a series of large hydropower units were built on the Columbia River? (3 points)

Which of these is the most practical method to prevent global water shortage? (3 points)

Stormwater runoffs carry oil leaked by vehicles on a highway into a pond. This is an example of (3 points)

Some farmers in a location use water from a nearby lake to irrigate crops. The people in the location believe that this may cause environmental problems because of the drying up of the lake. Which of these is the best method to solve this problem? (3 points)

The picture below shows the weather station model at a particular location. Which of these statements best describes the future weather condition at the location? (3 points)

The picture below shows a science model. The model most likely represents a (3 points)

Which of these Earth systems interact when acid rain corrodes rocks? (3 points)

Which of these is a process during which the hydrosphere interacts with the geosphere? (3 points)

Two states of matter present in the water cycle are described below. State 1: Takes the shape of the part of the container which it occupies. State 2: Has a fixed shape. Which of these statements is correct about the two states of matter? (3 points)

Scientists believe that the Earth’s orbit gradually changes from being elliptical to being nearly circular and then back to elliptical in a period of about 100,000 years. This causes global climatic change. The more elliptical the Earth’s orbit, the greater the difference in (3 points)