Ontario Grade 9 Science Practice Exam 2025 – Complete Study Resource

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What is the greenhouse effect?

The cooling of Earth’s surface due to ozone depletion

The warming of Earth’s surface caused by greenhouse gases trapping heat

The greenhouse effect refers to the warming of Earth's surface that occurs when greenhouse gases, such as carbon dioxide, methane, and water vapor, trap heat in the atmosphere. These gases allow sunlight to enter the Earth's atmosphere but prevent some of the heat that the Earth emits from escaping back into space, creating a 'blanket' effect that keeps the planet warm enough to support life.

This process is essential for maintaining a stable climate; without it, Earth would be too cold for most forms of life to survive. The greenhouse effect drives weather patterns, regulates temperatures, and influences ecological balance, making it a fundamental aspect of Earth's system. Understanding this concept helps us recognize the importance of managing greenhouse gas emissions to mitigate climate change.

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The process of energy being absorbed by water bodies

The increase in biodiversity due to habitat restoration

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