Ontario Grade 9 Science Class Practice Exam

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Prepare for the Ontario Grade 9 Science Class Exam. Engage with interactive questions and detailed explanations to solidify your knowledge. Enhance your understanding of essential science concepts and boost your confidence for the test!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

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.