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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)

The picture below shows a land surface in a location in Florida. Which of these most likely caused the cavities in the land surface? (3 points)

Humans cut down trees in a location. This caused an increase in temperature and decrease in rainfall in that location. Which of these Earth systems interacted to produce this difference in climate? (3 points)

Scientists worldwide agree that atmospheric carbon dioxide enhances the greenhouse effect. However, they differ in their opinions about the effects that the enhanced greenhouse effect has on the global climate. Which is the most likely effect of the differing opinions among scientists, regarding global warming? (3 points)

Hydroelectric power plants can generate huge amounts of electricity. Which of these statements best describes the impact of a hydroelectric power plant on the environment? (3 points)

The graph below shows the changes in the temperature of ice when it is heated from −20 °C to 100 °C. Based on the graph, which of these conclusions is correct? (2 points)

Which of these surface features are formed when the acid in groundwater reacts with limestone? (3 points)

Which of these questions can be answered using scientific methods? (2 points)

In ancient times, scientists believed that matter could be destroyed by burning or breaking. Modern scientists believe that matter cannot be destroyed. What best accounts for these different opinions? (2 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: Spreads across the entire volume of a container and takes its shape. Which of these statements is correct about the two states of matter? (3 points)