Exploring Biogeochemical Cycles on Earth

The video tutorial explores the recycling of matter on Earth, focusing on the law of conservation of matter, which states that matter is neither created nor destroyed but changes form. It covers various cycles, including the carbon, water, nitrogen, phosphorus, and sulfur cycles, explaining how elements are recycled through natural processes. The tutorial highlights the role of photosynthesis, fossil fuels, and bacteria in these cycles, emphasizing the interconnectedness of Earth's systems.

What does the law of conservation of matter state?

• Matter can be created and destroyed.

• Matter is only created, not destroyed.

• Matter is neither created nor destroyed, only changes form.

• Matter is only destroyed, not created.

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Which molecule is formed during photosynthesis?

• Water

• Carbon dioxide

• Glucose

• Carbonic acid

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What happens to carbon when fossil fuels are burned?

• It turns into water.

• It releases CO2 into the atmosphere.

• It becomes carbonic acid.

• It forms glucose.

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NGSS.MS-PS1-5

What is the process called when water changes from a liquid to a gas?

• Transpiration

• Evaporation

• Precipitation

• Condensation

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NGSS.MS-PS1-4

Where is most of our water stored?

• In aquifers

• In plants

• In the soil

• In the atmosphere

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What percentage of our air is made up of nitrogen?

• 70%

• 50%

• 30%

• 90%

What do denitrifying bacteria convert nitrogen waste into?

• Nitrites

• Nitrates

• Ammonia

• Nitrogen gas

What is the chemical symbol for phosphate?

• CO3

• NO3

• SO4

• PO4

Which organisms break down dead plants and animals to return phosphates to the soil?

• Fungi

• Bacteria

• Plants

• Animals

What gas is released by volcanoes and fossil fuels that can lead to acid rain?

• NO2

• H2S

• SO2

• CO2