Ontario Grade 9 Science Class Practice Exam

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Master Grade 9 Science with our comprehensive practice exam. Test your knowledge, identify weak areas, and boost your confidence for academic success.

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What are comets made of?

Gas and dust only
Lava and rock
Ice, rock, and dust
Liquid water and minerals

The correct answer is: Ice, rock, and dust

Comets are astronomical objects made of ice, rock, and dust. Option A is incorrect because comets are not exclusively made of gas and dust. While they may have a gas-like appearance due to the sublimation of ice, they also contain solid materials. Option B is incorrect because comets do not have a molten or liquid interior, and are not composed of lava. Option D is incorrect as comets are not known to have liquid water as a component, and minerals only make up a small fraction of their overall composition. Therefore, the best answer is C which includes all three components commonly found in comets.