Spheres of Earth — Unit test Answers

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

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

Which phrase describes the relative age of a rock?

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?

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

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

The image shows flat sedimentary rock layers in the foreground and angled sedimentary rock layers in the background.

A volcanic eruption releasing rock, ash, and dust particles into the air is an example of which interaction?

How might an entire insect be preserved?

Which best describes eras and periods?

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?

Which event would most likely cause a competition for water?

Study the diagram of the geologic time scale.Which method is most likely used to identify what happened before the start of the Paleozoic era?

Which example describes biotic factors interacting with the environment?

Which feature causes a gap in the geologic record?

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

Which sphere of Earth includes icebergs?

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

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