Edward Abbey says that Lake Powell which is formed by Glen Canyon Dam is not a lake but is a reservoir.This means that there is a constantly fluctuating water level based on the power needs of the system that the Dam is connected to. Also this power need is primarly focus of the orchestrators of the dam not the recreational possibilities that they publicize. <span>The drastic change of environment around the river, and the continuous changes of water level, had huge negative impacts on wildlife that were settled near it. The only thing noticeable around the edge of the water is the bathtub ring left by the change of water level.</span>
Basically twice means 2 in these sentence twice means more than he earn in short words he wants to say that he wants to earn more than he is earning now
for example someone is earning $500 every month so he want to earn $1000 every month
He should use a hands on, interactive approach where the audience gets to try using the computer buttons and features. Your text will have a word that means hands on or interactive.