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The Water Cycle and its Importance to Living Things

Learn about the water cycle, its different stages (evaporation, condensation, precipitation), and its significance to all organisms on Earth.

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The Water Cycle and its Importance to Living Things

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  1. Chapter E2 Section 1The Cycles of Matter Do Now What are the three different physical states of water that are found on Earth? Name one way that you use water in each of these states in your daily life. Write your answers in your science journal.

  2. MS-PS1-2 The Water Cycle Objectives • Diagram the water cycle, and explain its importance to living things.

  3. MS-PS1-2 The Water Cycle Agenda • Today we will: • Day 1 • Complete a do now

  4. MS-PS1-2 The Water Cycle Vocabulary • evaporation • condensation • precipitation • transpiration

  5. Section1 The Active River Chapter H1 The Water Cycle • What Is the Water Cycle? The water cycle is the continuous movement of Earth’s water from the ocean to the atmosphere to the land and back to the ocean. • Powering the Water Cycle The water cycle is driven by energy from the sun.

  6. Section 1The Cycles of Matter Chapter E2 The Water Cycle • The movement of water between the oceans, atmosphere, land, and living things is known as the water cycle. • How Water MovesDuringevaporation,the sun’s heat causes water to change from liquid to vapor. • In the process ofcondensation,the water vapor cools and returns to a liquid state.

  7. Section 1The Cycles of Matter Chapter E2 The Water Cycle, continued • The water that falls from the atmosphere to the land and oceans is calledprecipitation. Rain, snow, sleet, and hail are all forms of precipitation. • A small percentage of the water from precipitation is frozen as snow and ice and does not return back to the cycle right away. • Most precipitation falls into the ocean. • The precipitation that falls on the land and flows into streams, rivers, and lakes is called runoff.

  8. Infiltration is the process that creates Groundwater. Groundwater is precipitation that seeps into the ground and is stored between or within rocks. Groundwater slowly flows back into the soil, streams, rivers, and oceans.

  9. Section 1The Cycles of Matter Chapter E2 The Water Cycle

  10. Section1 The Active River Chapter H1 Water Cycle Click below to watch the Visual Concept. You may stop the video at any time by pressing the Esc key. Visual Concept

  11. Section 1The Cycles of Matter Chapter E2 The Water Cycle, continued • Water and LifeWithout water, there would be no life on Earth. All organisms, from bacteria to animals and plants, are composed mostly of water. • Water helps transport nutrients and waste within an organism. • Water helps regulate temperature. • All water taken in by an organism is eventually returned to the environment.

  12. About 70% of the Earth is covered in water. • Only 1% of that water is drinkable (potable).

  13. Change of State • Change of state is the change of a substance from one physical form to another. ALL CHANGES OF STATE ARE PHYSICAL CHANGES

  14. Melting(endothermic) heat in • Melting is the change of state from a solid to a liquid. Adding energy to a solid increases the temperature. As the temperature increases, the particles of the solid move faster and faster. Once the substance reaches it’s MELTING POINT, it becomes a liquid.

  15. Boiling(endothermic) heat in • Boiling is the change of a liquid to a vapor or gas. • Boiling occurs when the vapor pressure of the substance reaches the atmospheric pressure. The temperature at which this occurs is called the boiling point.

  16. Sublimation(endothermic) heat in • Sublimation is the change of state where a solid turns directly into a gas. Skipping the liquid phase. • During sublimation, the particles must gain enough energy to overcome their attraction, going from being very tightly packed together (as a solid) to rapidly moving and spreading apart (as a gas).

  17. Freezing(exothermic) heat leaving • Change of state from a liquid to a solid. • Freezing is the reverse of melting so the melting point and freezing point for a substance is the same. • During the freezing process, energy is removed from the substance causing the particles to slow which creates an attraction between them. The particles slow until they lock (or freeze) into place.

  18. Evaporation(Exothermic) • Evaporation is the change of a substance from a liquid to a gas. • Evaporation does not mean boiling. A substance can evaporate without boiling, for example sweat.

  19. Condensation(exothermic) heat leaving • Condensation is the change of state from a gas to a liquid. • The condensation point is the temperature at which a gas becomes a liquid. • During condensation, the fast moving particles of a gas clump together as energy (or heat) is removed.

  20. Section3 Changes of State Chapter K2

  21. MS-PS1-2 The Water Cycle Exit Ticket • Why is water so important? • How does water change state and move around on earth?

  22. MS-PS1-2 The Water Cycle Homework

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