"One Day's Domestic Water" Environment and Us PPT Courseware

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"One Day's Domestic Water" Environment and Us PPT Courseware

Water resources (freshwater resources) crisis!

Information 1: 71% of the earth’s surface is covered by water. However, the freshwater resources that humans can actually utilize only account for about 0.26% of the earth's total water.

Data 2: my country’s total freshwater resources are 2.7 trillion cubic meters, ranking sixth in the world, but the per capita water volume is only equivalent to 1/4 of the world’s per capita water, ranking 110th in the world. my country is a major country with serious water shortages, ranking among the top among more than 40 countries with serious water shortages. Moreover, the spatial and temporal distribution of water resources in my country is uneven and does not match the regional distribution of cultivated land and population. The spatial and temporal distribution is also unbalanced. About 70% of the rainwater is concentrated in summer and autumn, mostly in the form of heavy rain. The above unfavorable natural factors have destined our country to be a water-scarce country. Currently, more than 200 cities in my country are short of water.

How much water did you use yesterday?

1. Units for calculating water volume: milliliter (ml), liter (L)

2. 1L=1000ml 500ml=1 bottle of drink capacity

3. Work in groups to calculate the water consumption of each person in the group yesterday, and then calculate the average water consumption of the group. (Hint: Add up the water consumption of everyone in the group yesterday and divide it by the number of people in the group to get the average water consumption of the group.)

Check the water meter at home. How much water does our family use in a day?

Divide the daily water consumption by the number of people in the household to get the average water consumption per person per day.

Due to rapid population growth, environmental pollution and global warming, the world's per capita water supply has begun to decrease since 1970 and continues to decline. At present, 60% of the continent faces insufficient fresh water resources, and more than 100 countries are seriously short of water, including more than 40 countries with the most serious problems. It is expected that the global per capita water supply will decrease by one-third in the next 20 years.

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For more information about the PPT courseware "Environment and Our Daily Use of Water for Living", please click the "Environment and Our Daily Use of Water for Living" ppt tag.

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Update Time: 2024-11-22

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 2 industry PPT template

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