Educational worksheet on biogeochemical cycles, focusing on the water and carbon cycles with interactive fill-in-the-blank exercises.

Let’s solve this step by step. We’ll fill in the blanks for both the Water Cycle and Carbon Cycle sections using the word banks provided.

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Water Cycle: Fill in the blanks

We have these words to choose from:
evaporation, clouds, precipitate, condenses
dries up, heavy, vapor, atmosphere
heating, plants, oceans, lakes
droplets, snow, hail, glaciers
runoff, rivers, cycle, sleet
rain, evaporates, droplets, vapor

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Evaporation section:

> On a warm, sunny day, a glass of water seems to slowly disappear. This is because the energy from the sun heating the water and turns the liquid water into water vapor. This process is called evaporation. When the water evaporates, it becomes a gas in the atmosphere.

✔ Checked: “heating” fits as the sun heats the water. “Vapor” is the gas form. “Evaporation” is the name of the process. “Evaporates” is the verb form. “Atmosphere” is where the gas goes.

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Condensation section:

> As the water vapor rises, it cools off and condenses into water droplets. If the water vapor becomes extremely cold, it will form ice crystals instead of water droplets. As the water droplets or ice crystals grow bigger and more numerous, they form clouds.

✔ Checked: “Condenses” is what happens when vapor cools. “Droplets” are tiny water drops. “Clouds” are made of many droplets or ice crystals.

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Precipitation section:

> If water droplets or ice crystals become too heavy, they can’t stay in the air. They precipitate. Water droplets precipitate as rain, sleet, hail, or snow.

✔ Checked: “Heavy” makes them fall. “Precipitate” is the verb for falling. The types are rain, sleet, hail, snow — all in the word bank.

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Collection section:

> This precipitation gathers into rivers and streams that flow down to the lakes and oceans. This is called runoff. Not all of the water makes it back to the oceans and lakes right away. Some of it is used by animals and plants. Some is frozen into glaciers. Eventually, the animals and plants breathe the water out and the glaciers melt, releasing the water back into the water cycle.

✔ Checked: “Rivers” collect water. “Runoff” is the term for water flowing over land. “Plants” use water. “Glaciers” store frozen water. “Cycle” completes the loop.

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Carbon Cycle: Fill in the blanks

Word bank:
Coal, Oil, Natural Gas, burning of fossil fuels, decayed
Photosynthesis, Respiration, ocean, glucose, Greenhouse

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a. Plants use CO2 in the process of Photosynthesis to make glucose and oxygen.

✔ Plants take in CO2 and sunlight to make food (glucose) and release oxygen — that’s photosynthesis.

b. Animals use oxygen in the process of Respiration and make more CO2.

✔ Animals breathe in oxygen and breathe out CO2 — that’s respiration.

c. The ocean is the main regulator of CO2 in the atmosphere because CO2 dissolves easily in it.

✔ Oceans absorb a lot of CO2 from the air.

d. In the past, huge deposits of carbon were stored as dead plants and animals decayed.

✔ Dead stuff breaks down → decays → stores carbon underground.

e. Today these deposits are burned as fossil fuels, which include Coal, Oil, and Natural Gas.

✔ These are the three main fossil fuels listed.

f. More CO2 is released in the atmosphere today than in the past because of the burning of fossil fuels.

✔ Burning coal, oil, gas releases extra CO2.

g. Too much CO2 in the atmosphere may be responsible for the Greenhouse effect/global warming.

✔ CO2 traps heat → greenhouse effect → global warming.

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Final Answer:

Water Cycle Answers:

Evaporation:
- heating
- vapor
- evaporation
- evaporates
- atmosphere

Condensation:
- condenses
- droplets
- clouds

Precipitation:
- heavy
- precipitate
- rain
- snow

Collection:
- rivers
- runoff
- plants
- glaciers
- cycle

Carbon Cycle Answers:

a. Photosynthesis, glucose
b. Respiration
c. ocean
d. decayed
e. Coal, Oil, Natural Gas
f. burning of fossil fuels
g. Greenhouse