Unit Test — Unit test Answers

For which object would a geologist use carbon-14 dating to determine age?

Which correctly lists the three isotopes that geologists measure to determine the age of an organism’s remains?

Rosa drew a flow chart of the carbon cycle.

A tropical rainforest includes trees, animals, insects, plants, rain, rivers, rocks, soil, and warm, moist air.Which spheres of Earth are represented in a tropical rainforest?

Several cheetahs are growling at each other while hunting for animals. For which need are they competing?

Which best explains a primary reason for the inability of life to exist in Earth’s early atmosphere?

Which feature causes a gap in the geologic record?

Which best describes eras and periods?

Which spheres of Earth are directly influenced when human-caused air pollution leads to acid rain that dissolves limestone rocks?

Which phrase describes the relative age of a rock?

The diagram illustrates the water cycle.

Which event would most likely cause a competition for water?

Which is one piece of information that fossils in samples from Earth’s crust reveal about Earth’s history?

Which is the first step in the process during the formation of molded fossils?

Some consumers, like lions, do not eat plants or any other producers. They only eat other animals.How do lions obtain the carbon they need?

A group of the same species of salmon lives in a stream. Which level of organization does this best describe?

Which sphere of Earth includes icebergs?

Which evidence suggests that several mass extinctions have occurred during Earth's history?

The image shows cross-cutting relationships. B, W, E, and K represent rock layers, and Q represents a fault.

After two half-lives, how much of the original material has decayed?