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Cycles in Nature


Cycles in Nature Chapter 2 Section 1 The Cycles of Matter – PowerPoint PPT presentation

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Title: Cycles in Nature

Cycles in Nature
  • Chapter 2
  • Section 1
  • The Cycles of Matter

The Cycles of Matter
  • 1. What is matter?
  • Anything that takes up space and has mass
  • Used over and over again
  • 2. How old is the matter in your body?
  • It has been on Earth since it was formed billions
    of years ago

Water Cycle
  • Movement of water among oceans, atmosphere,
    land, and living things

Water Cycle
  • 1. Precipitation
  • Happens when water moves from the atmosphere to
    land and oceans

Rain, snow, sleet , and hail
Water Cycle
  • 2. Evaporation
  • The suns heat causes water to change from liquid
    to vapor

Water Cycle
  • 3. Condensation
  • When water vapor cools it forms a liquid that can
    fall back to Earth as precipitation

Water Cycle
  • 4. Ground Water
  • A. Water that is found underground and stored in
    caverns or porous rock
  • B. May stay in the ground for hundreds or
    thousands of years
  • C. Provides water to soil, streams, rivers, and

Water Cycle
  • 5. Transpiration
  • A. Plants move water vapor into the atmosphere
  • B. Plants do this by releasing water vapor
    through tiny openings in their leaves

Water and Life
  • A. Our body is made up of 70 water
  • B. Water carries waste away from our body tissues
  • C. Water helps regulate body temperature through
    perspiration sweating and evaporation
  • This way of returning water to the environment is
    called- transpiration

Bell Work
  • Draw the water cycle in your science notebook or
    science binder
  • Include in your drawing pictures and explanations
    for the process
  • Your drawing should include
  • Evaporation
  • Condensation
  • Precipitation
  • Transpiration
  • Groundwater
  • Sun
  • Tree
  • Clouds

Bell Work
  • What process in the water cycle changes water
    from a liquid to water vapor (gas)?
  • What process in the water cycle changes water
    from a gas to a liquid?

  • What is GOOD about Carbon?
  • What is BAD about Carbon?

Carbon Cycle
  • Carbon
  • All living things need carbon because it is part
    of all biological molecules (fats, sugars,
  • Carbon Cycle
  • Movement of carbon from the environment into
    living things and back to the environment

Carbon Cycle
  • 1. Photosynthesis
  • A. How carbon cycles from the environment into
    living things
  • B. Plants use CO2 from the air to make sugars (or
    their own food)
  • C. Animals get carbon they need from eating plants

Carbon Cycle
  • 2. Cellular Respiration
  • A. How carbon returns to the environment from
    living things
  • B. Living things break down sugar molecules to
    release energy
  • C. During this process, CO2 and water are

Photosynthesis/Cellular Respiration Equations
  • Photosynthesis
  • (process of changing light energy into chemical
  • SunlightCO2water (produces?) glucoseO2
  • Cellular Respiration
  • (process when cells break down food to get
  • GlucoseO2 (produces?) EnergyCO2water

Bell Work
  • Name the process in the carbon cycle where carbon
    is moved from the environment into living things?
  • Hint (What process uses carbon dioxide (CO2)?

Carbon Cycle
  • 3. Decomposition
  • A. Break down of dead material into CO2 and H2O
  • B. When fungi and bacteria decompose organic
    matter, they return CO2 to the environment

Carbon Cycle
  • 4. Combustion
  • A. Process of burning fossil fuels
  • B. Fossil fuels-materials that are slowly formed
    underground from the remains of plants and
    animals that died million of years ago

Carbon Cycle (combustion cont.)
  • C. Carbon in coal, oil, and natural gas return to
    atmosphere as CO2 when these fossil fuels are
  • D. Combustion provides the fuel people need to
    drive cars, heat homes, and make electricity
  • E. Deforestation-removal of forests

Carbon Cycle Practice Quiz
  • Demo/Quiz

How has Carbon Dioxide levels changed in the
  • A. CO2 in the atmosphere has increased since the
    burning of more fossil fuels
  • B. Many scientists believe that extra CO2 from
    fossil fuels is adding to global warming

Carbon Dioxide in the Atmosphere
Carbon Cycle
  • Draw the carbon cycle in your science notebook or
    science binder
  • Include in your drawing pictures and explanations
    for the process
  • Your drawing should include
  • Photosynthesis Cellular Respiration
  • Decomposition Combustion
  • Tree or plants Animals
  • Fossil fuels Use of fossil fuels
  • Deforestation

Quiz Review
  • 1. Where does most of Earths precipitation
  • 2. What is the process where sunlight, carbon
    dioxide (CO2), and water is used to make glucose?
  • 3. What is the process where glucose is broken
    down for energy and carbon dioxide is released?

Quiz Review
  • 4. What are fossil fuels? Name 3 examples.
  • 5. Name 3 ways carbon dioxide is transferred from
    living things into the environment?
  • 6. What is the water cycle process where liquid
    water returns to the atmosphere?

Quiz Review
  • 7. What is the process called when water vapor
    cools? And what is formed?
  • 8. What is deforestation?
  • 9. What is released during decomposition?
  • 10. Where is carbon found?

Nitrogen Cycle
  • The movement of nitrogen from the environment to
    living things and back again

Nitrogen Cycle
  • A. 78 of the Earths atmosphere is nitrogen gas
  • B. Most organisms can not use the nitrogen in the
    air they breathe
  • C. Living things need nitrogen to make proteins
  • How do living things get nitrogen?
  • A.Nitrogen fixation-when bacteria in the soil
    change nitrogen gas into a formed that can be
    used by plants
  • B. Most animals get their nitrogen they need from
    eating plants

Nitrogen Cycle
  • D. Animal wastes return nitrogen back to the soil
    and plants use this nitrogen
  • E. When plant or animals die, decomposers break
    down the remains and nitrogen recycles back into
    the soil

Nitrogen Cycle
  • How does nitrogen get from the soil back into the
  • Denitrification-to take nitrogen out of the soil
    and change it to nitrogen gas that is released
    into the atmosphere
  • Denitrifying bacteria produce nitrogen gas as a
    waste that is released in the atmosphere and
    completes the cycle

  • How is this fungi important to the carbon cycle?

Manure (animal waste)
  • Why is this farmer spreading manure on the field?
  • Explain the importance of this procedure in the
    nitrogen cycle?

Bell Work
  • 1. Why do we need nitrogen?
  • 2. What is the process when bacteria change
    nitrogen into a usable form that can be used by
  • 3. What is the process when bacteria take
    nitrogen out of the soil and change it to a gas
    that is released in the atmosphere?

Ammonia NH3
Question 21
Review (pages 42-43 in text book)
  • Answer
  • 1-3, 6-7, 9-12
  • 14
  • 19
  • 24-25