Answer:
The troposphere
Explanation:
The answer is the troposphere because Most of the water vapor in the atmosphere, along with dust and ash particles, are found in the troposphere explaining why most of Earth's clouds are located in this layer. Temperatures in the troposphere decrease with altitude.
Answer:
The Niger River will be heavily exploited in the future so that it helps the economies in people in the region.
Explanation:
Most of the big rivers around the world are heavily exploited. They have huge dams built on them for multiple purposes, canals that connect places that don't come out on the rivers, transportation, and travel are well organized and on a high scale. The Niger River though is not that exploited despite having huge potential, but that will change in the near future for sure.
This river goes a long way in the interior of Western Africa and the outskirts of Central Africa. It can support boats, and it is the major factor that supports agriculture. Considering that this part of the world is in a dire situation but develops quickly, the Niger River will be used for sure. Huge dams will be made, and the water will be used for the production of electric power to feed the economies, but also for irrigation as the region is mostly semi-arid, for drinking, and for the industry. In order to boost the economy and help in the development of the large urban areas, canals will be made to the ones that are not located at the river's banks. Transportation through the river's waters will skyrocket as it will be fast, safe, and cheap.
Explanation:
convergent plate boundaries
Natural phenomena such as earthquakes, mountain formation, and volcanoes occur at plate boundaries. Mountains are usually formed at what are called convergent plate boundaries, meaning a boundary at which two plates are moving towards one another. This type of boundary eventu
Answer:
Solar energy
Explanation:
Solar energy is renewable and a very cheap energy source that can easily be harnessed for a wide range of uses domestically and industrially.
Solar energy is sourced from the sun. Nuclear fusion within the sun releases a massive amount of energy into the solar system. The sun furnishes the solar system with insolation which can be used by living organisms and can be converted to other sources of energy.
This energy source is free and very much available almost all year round.
Answer:
The required efficiency of BOD5 removal of the plant needs to be at least 91%
Explanation:
Even though a WWTP (Waste water treatment plant) has several unit operations, it needs to have an overall treatment efficiency. In this case, it is only required to know how much BOD5 do we need to lower by removing organic matter from the water. It goes as following:

This will work for any efficiency, for any parameter you need to define. They need to be in the same concentration unit, of course.
Replacing known values, we have:

Which we will approximate to 91%, because decimal percentages do not say anything and are not currently used.