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Science C2L5
The Water and Carbon Cycles
Unlike the sun's energy that we receive, the water supply on Earth does not get replenished.
The water on Earth today is the same water that was on Earth before history was even recorded.
Water has been and will continually be reused and recycled in a process known as the Water Cycle.
How many examples of water can you think of?
Think about the various ways water returns to the Ocean.
HW Time
Read pages 52-55
Questions 1-3
Page 57
Questions 1-7, 12, & 14
The Water Cycle
Energy from the Sun warms Earth's surface and causes water to evaporate.
Evaporated water (vapour) enters the atmosphere, cools, and changes back into liquid water in the form of clouds (condensation).
Water returns to the Earth as a form of precipitation (rain, snow, etc.)
Water pours directly into other water bodies (ocean, streams, etc.) or is absorbed into the Earth's crust.
Water may remain underground for many years, but eventually returns to the ocean.
The Carbon Cycle
Water cycles through both the living and non-living
parts of the ecosystem.
In the living part of ecosystems, animals recycle water through various forms of hydration and excretion.
Plants take up water with their roots, and recycle the water through evaporation from their leaves.
Like the water cycle, the carbon cycle is one of the most important cycles in the world.
The carbon cycle is key as without it our oxygen levels would drop and we would not have many fossil fuels.
Similar to how no new water arrives on Earth, no new carbon arrives neither.
Carbon can be found everywhere on Earth from rocks on the ground to the air we breathe. In air, carbon is found in the form of carbon dioxide.
Carbon can be cycled through plant photosynthesis, animal respiration, and energy utilization.
Just like how water does not stay in the atmosphere for long, the same rule applies to water in the bodies of plants and animals.
Water can however spend thousands of years in the deepest parts of oceans and trapped in glaciers.