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 is the solar wind?

A stream of electrically charged particles produced by the sun's corona
Space and all the matter and energy in it
A biological community of interacting organisms and their physical environment.
Scientific study of interactions among organisms and between organisms and their environment

The correct answer is: A stream of electrically charged particles produced by the sun's corona

The solar wind is a stream of electrically charged particles produced by the sun's corona. This option is correct because the solar wind specifically refers to the particles emitted by the sun, rather than the entire universe (option B), a biological community (option C), or the scientific study of interactions (option D). The solar wind is a distinct phenomenon and its definition is limited to the charged particles emitted by the sun.