Unit 3 Review

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What is the principle of conservation of mass?

Back

The principle of conservation of mass states that matter cannot be created or destroyed in a closed system. It means that the total mass of substances before and after a chemical reaction remains the same.

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What happens to the mass of clay when its shape is changed?

Back

The mass of the clay remains the same when its shape is changed. This demonstrates that matter is not destroyed when it changes form.

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What is the biosphere?

Back

The biosphere is the global sum of all ecosystems. It is the zone of life on Earth, including land, water, and the atmosphere.

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What is the hydrosphere?

Back

The hydrosphere includes all the water on Earth, such as oceans, rivers, lakes, and groundwater.

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What is El Nino?

Back

El Nino is a climate pattern that describes the unusual warming of surface waters in the eastern tropical Pacific Ocean, which can lead to significant weather changes.

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How can planting trees on steep hills help during heavy rains?

Back

Planting trees on steep hills can help prevent soil erosion and reduce the risk of landslides during heavy rains.

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What are sandbags used for in flood prevention?

Back

Sandbags are used to create barriers that prevent river water from entering buildings and other areas during floods.

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What is the difference between the biosphere and the geosphere?

Back

The biosphere refers to all living organisms and their environments, while the geosphere refers to the solid parts of the Earth, including rocks and soil.

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What is a model in scientific experiments?

Back

A model is a simplified representation of a system or concept that helps scientists understand and predict how it works.

Front

What should scientists do if their model has negative effects on the environment?

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Scientists should analyze the negative effects and make improvements to their design to minimize harm to the environment.