Biology, asked by Mongolian, 20 days ago

Name of the activity : to understand the water cycle from a replica or model of the water cycle 1) purpose or importance of the activity 2. proposed time duration for the activity 3) materials and apparatus required for the activity 4) Metholelogi of the activity 5) diagram or photograph of the activity 6) concepts that have become clear during the activity 7) what new things did you heart? 8) Conclusion :- write your own opinion or experience about the activity 10) Co - operation from the parents. 11) Opinion of the parents 12) Persons who have helped you 13) list of the reference materials

Answers

Answered by hitenderyadav7225

Have students answer some or all of the questions in lab notebooks for collection and evaluation.

Challenge the students to use their understanding of the water cycle to explain a related phenomenon. Example:

Put 1/2 inch or so of sand or gravel in a re-sealable plastic bag.

Add 1/4 cup of water (color the water blue for easier visibility).

Put it in a sunny window or under a bright light.

The students should see evaporation/condensation/precipitation and infiltration take place. They should identify that transpiration was not part of the system.

Modifications for Alternative Learners

Students with language difficulties should be encouraged to rely on labeled diagrams to help answer the assessment questions.

Background

Water is in the atmosphere, on the land, in the ocean, and underground. It moves from place to place through the water cycle. As it moves through the water cycle, water often changes from a liquid to a solid (ice) to a gas (water vapor). Water in oceans and lakes is typically liquid, but it is solid ice in glaciers, and often water vapor in the atmosphere.

Temperature and pressure determine the phase of water (solid, liquid, or gas).

Water molecules arranged as ice, liquid, and water vapor

Water is essential for life on Earth. It is recycled through the water or hydrologic cycle, which involves the following processes:

Evaporation, the changing of water from a liquid to a gas

Condensation, the changing of water from a gas to a liquid

Sublimation, the changing of water from a solid to a gas

Precipitation, the process by which water molecules condense to form drops heavy enough to fall to the Earth's surface

Transpiration, the process by which moisture is carried through plants from roots to leaves, where it changes to vapor and is released to the atmosphere

Surface runoff, the flowing of water over the land from higher to lower ground

Infiltration, the process of water filling the porous spaces of soil

Percolation, groundwater moving in the saturated zone below the surface of the land

Diagram of the water cycle. Water evaporates from the surface of the earth, rises into the atmosphere, cools and condenses into rain or snow in clouds, and falls again to the surface as precipitation.

Water at the surface of the ocean, rivers, and lakes can become water vapor and move into the atmosphere with a little added energy from the Sun through a process called evaporation. Snow and ice can also become water vapor through a process called sublimation. Water vapor gets into the atmosphere from plants by a process called transpiration.

Because air is cooler at higher altitude in the troposphere, water vapor cools as it rises high in the atmosphere and transforms into water droplets by a process called condensation. The water droplets that form make up clouds. If the temperature is cold enough, ice crystals form instead of liquid water droplets. If they grow large enough the droplets or ice crystals eventually become too heavy to stay in the air, falling to the ground as rain, snow, and other types of precipitation.

Through these processes, the amount of water on Earth remains nearly constant and is continually recycled through time. Water molecules may remain in one form for a very long period of time (for example, water molecules can be locked in Antarctic ice for thousands of years) and in other forms for very short times (for example, water molecules in desert rainstorms spend mere minutes as surface water before evaporating into vapor again).