Copy of EarthSci Q1 W5 Water.pptx.........

The lesson discuss about the water

1. Earth’s Water Science

2. Direction: Write the letter of the correct answer on a separate sheet of paper. 1. What processes is involved as water absorbs heat energy from the sun and turns to vapors? A. condensation B. evaporation C. transpiration D. volatilization 2. Which refers to the continuous movement of water on, above and below the surface of the Earth? A. water cycle C. hydrological cycle B. hydrologic cycle D. all choices are correct 3. How is freshwater being replenished in earth that makes water a renewable natural resource? Water is replenished in earth through the ________________. A. precipitation of water C. filtration of water to the ground B. melting of snow and glaciers D. transpiration in plants and animals 4. Which condition is described when the entire population has sustainable access to adequate quantities of acceptably clean water? A. water supply C. water insecurity B. water security D. water contamination 5. Which of the following shows human activities that greatly affect the supply of water fit for human consumption? A. population growth C. construction of structures B. increase agricultural yield D. irrigation and aeration of soil

3. How does the Earth support life? Water (H 2 O) is made of two atoms of hydrogen and one atom of oxygen bonded together. It has the capability to dissolve more substances than any other liquid that made it the “universal solvent”. This means that wherever there is water, either through the air, the ground, or through our bodies, it takes along valuable chemicals, minerals, and nutrients that plays a vital role in all living organisms. These makes water vital element needed in our daily activities as a living being. Water is not just essential to our health but also for numerous household tasks like cooking, bathing, drinking, and cleaning. The abundance of water in Earth is also observable even in space.

4. Humans needed to manage properly the freshwater the world has. Figure 2 shows from the 2.5% freshwater glaciers makes up 68.7% which humans have less or no access to it and the 30.1% groundwater needed to be extracted first that leaves less 1% that can be used readily. Therefore, humans rely on surface water and groundwater for domestic, agricultural, and industrial use. shows the usage of groundwater.

5. This is how the water underground is refilled if the infiltration of precipitation restores the aquifer, the groundwater is considered “ renewable” when refilled either very slowly or not at all it is known as “non-renewable” . The largest aquifers of non-renewable water are found in North Africa, the Middle East, Australia, and Siberia. There are some debates about how and when to use this water. Many aquifers that contain non-renewable groundwater resources are shared by more than one country and need to be managed in common for the benefit of all governmental entities concerned.

6. Water use and consumption In water cycle, water turns to gaseous form when the temperature increases then goes back as rain, snow, or hail through precipitation. The rainwater enters lakes, rivers, and groundwater – “blue water” while “green water” is the amount of rainfall either captured by vegetation or enters the soil and absorbed by plants for photosynthetic activity that goes back to the atmosphere through evapotranspiration. This difference may help managers focus on those which green water feeds and passes through, such as farms, forests, and wetlands.

7. Most of the human activities are threats to the quality and quantity of the Earths’ water system. A few of these activities are as follows: 1. In farming , sewage runoffs from farms and gardens may contain nitrogen and phosphorous triggers uncontrolled plant growth. This will also lead to bioaccumulation of toxic materials which might be taken in by aquatic organisms that may have an active effect once it enters circulation in the food chain.

8. 2. Improper waste disposal during industrial production causes water pollution. The dissolved oxygen in bodies of water decreases which leads to low production of aquatic resources. 3. The excessive water withdrawal reduces a considerable amount of water supply intended for public utility use. 4. The clearing of land to build roads and other construction structures increase surface runoff and cause landslides or flash floods in sloping areas. This also leads to low and slow infiltration in recharging groundwater supply.

9. Instruction: Match the process to the identified numbers 1-6 indicated in figure 6 then provide correct answer to the questions that follows. Write your answer on a separate sheet of paper.

10. Questions: 1. What causes water to undergo phase change? 2. What happen to heat when water vapor changes to snow then to rainwater, water in solid and liquid form at the Earths’ surface to water vapor? 3. What is the significance of the presence of water in the atmosphere despite it only comprises of 1% of the total freshwater supply in the planet? 4. How do the concepts of virtual water and water footprints secure the availability of water supply? __________________________________

11. Instruction : Provide correct answers to the given questions briefly and concisely on a separate sheet of paper. What do you think is the role of humans to Earth? 2. How can Earth maintain its sustainability to life? 3. Why is desalination of saltwater not commonly used in addressing low supply of water for agricultural and industrial purposes?