World oil reserves amount to about 10,000 ej, and humankind uses energy at the rate of roughly 18 tw. if all our energy came from oil, and assuming there was no growth in energy consumption, estimate the time left until we would exhaust that 10,000-ej reserve.

What does it mean if a piece of wood is ripped? it has been water-damaged. it has been cut with the grain. it has been cut against the grain. it has been covered with laminate.

This is a 2017 topographic map of puerto rico in the united states, and i'm sorry that people there have suffered such a disaster. i want to ask, what do the yellow dots and areas represent on this graph? and the blue area and the little blue circle, and the little blue sign that looks like a signal tower, what do they stand for?

What is one early technological advance that shaped culture? a the use of fire b the discovery of arable land c family units. d migration