The answer is c. 1970.
The Clean Water Act came into force in the decade 1970s. The act is to regulate the discharges of pollutants into the waters and to regulate quality of surface water. The clean water act required industries to reduce or eliminate point source pollution in surface waters.
B nitrogen were trapped in rocks during extensive volcanic activity
Answer:
They provide us with accurate data that is needed to make adjustment on earth's surface.
Explanation:
- The use of techniques like the Global positioning system, Geographic information system, and remote sensing is a tool that provides us with geospatial information and help us understand the laws of nature.
- These all act as sensors and provides us information directly from the space with coordination to sun-synchronous and geostationary satellites.
- The use of technology like the lidar and radar also helps in understanding the global warming and deforestation patterns around the world.
The Theory of <span>Plate Tectonics</span>