<span>In terms of matter and resources, the Earth is essentially a closed system, because matter and resources are fixed.
</span>In terms of energy, the Earth is an open system, because there is a balanced transfer of energy. (The energy<span> radiates into the </span>Earth's system<span>, from the Sun and</span><span> then it is radiated back into space from the </span>Earth. The<span> flows of energy are regulated by the </span>Earth's<span> atmosphere and ozone layer.)</span>
Tarbela dam is the largest Earth filled dam in the world. It is buolt on river Indus, in Pakistan. Its primary use is electricity generation and supply water for irrigation by storing flows during the monsoon period and use it during the low flow period in the winter . Due to the lower rate of sedimentation, the useful life time of the dam has increased to 85 years.
Here, the option that is not valid is
D. It will be able to supply irrigation water for centuries.
Climate.
Climate is the overall weather for a region. Weather is over only a few days.
