Students are learning about the natural resources in Maryland. One group of students researches information about renewable natural resources in the state. The other group researches information about nonrenewable natural resources in the state. The resources the students investigate include plants, animals, soil, minerals, water, coal, and oil. Which nonrenewable natural resource heats homes?
A: natural gas

As the population of small fish in a lake decreases, the population of large fish that depend on the small fish for food will
A: decrease in number

Scientists compared Pluto with other objects in the solar system and found that Pluto is smaller than Earth's moon. This finding caused scientists to question whether Pluto is a planet because
A: the other planets are much larger than Pluto

During a lab investigation, students were asked to determine the best way to clean up an oil spill using different materials. Investigation Materials filter paper foam sponge metal wire screen thin sock filled with hair The students tested the materials by placing each material into separate buckets containing oil and water. They recorded their observations on which material absorbed the most oil. Why would the students' teacher ask them to repeat their tests?
A:
to improve the chances of obtaining accurate oil cleanup results