recycling materials

• How long has life on Earth existed?

  For billions of years
• Why has life on Earth been possible?

  Because it recycles everything
• What molecules are recycled on Earth?

  Water and carbon dioxide
• What happens to atoms over millions of years?

  They can be reused to make different organisms
• How many atoms are estimated to be in a human body?

  Six octillion atoms
• Where have the atoms in your body been recycled from?

  Oceans, volcanoes, other animals, and humans
• What are the two cycles covered in the study material?

  • Water cycle
  • Carbon cycle
• What is the first step in the water cycle?

  1. Energy from the sun causes evaporation
  2. Water evaporates from lakes, oceans, rivers, and land
  3. Transpiration occurs from plant leaves
• What happens to water vapor in the sky?

  It condenses into clouds
• What is the term for water falling back to Earth?

  Precipitation
• What can happen to water after precipitation?

  It can seep into soil or flow into rivers
• What are the main stores of carbon in the carbon cycle?

  • Atmosphere (as carbon dioxide)
  • Plants (in biological molecules)
  • Soil (with microorganisms)
  • Fossil fuels (underground)
  • Animals (in biological molecules)
• What is the most important process in the carbon cycle?

  Photosynthesis
• What do plants and algae do during photosynthesis?

  They convert carbon dioxide into biological molecules
• What happens to carbon after plants are consumed by animals?

  It can be released back to the atmosphere
• What occurs when organisms die in aerobic conditions?

  Microorganisms decay them, releasing carbon dioxide
• What happens to carbon in anaerobic conditions?

  It can be converted into fossil fuels
• What can fossil fuels produce when burned?

  Carbon dioxide
• What additional process can be included in the carbon cycle?

  Burning of plants or biofuels
• What should you do if you found the video useful?

  Like and subscribe
• Why is recycling important in ecosystems?

  It maintains balance and supports life
• What role do microorganisms play in decomposition?

  They break down dead organisms and recycle nutrients
• How does transpiration contribute to the water cycle?

  It releases water vapor from plants into the air
• What is the impact of human activities on the carbon cycle?

  They increase carbon dioxide levels through burning fossil fuels
• What is the relationship between photosynthesis and respiration in the carbon cycle?

  Photosynthesis absorbs carbon dioxide, respiration releases it
• What is the difference between anaerobic and aerobic conditions in decomposition?

  Aerobic conditions require oxygen, anaerobic do not
• What are the various forms of carbon storage in the environment?

  Atmosphere, plants, soil, fossil fuels, animals
• Why is energy from the sun significant in the water cycle?

  It drives the evaporation process
• What is the process of condensation in the water cycle?

  Water vapor cools and forms clouds
• What role does precipitation play in the water cycle?

  It returns water to the Earth's surface
• How do the water and carbon cycles interact in ecosystems?

  Water supports plant growth, which absorbs carbon
• What should you be able to describe by the end of the video?

  The processes in the carbon cycle
• Why do many students find the carbon cycle tricky?

  They think it is more complex than it is
• What is the starting point of the carbon cycle?

  Carbon dioxide in the atmosphere
• How does carbon enter the carbon cycle?

  Through photosynthesis
• What do plants combine with carbon dioxide during photosynthesis?

  Water
• What is produced during photosynthesis?

  Sugar glucose
• What type of energy is used in photosynthesis?

  Light energy
• Who carries out photosynthesis?

  Plants and algae
• What process returns carbon dioxide to the atmosphere?

  Aerobic respiration