Which of the following is an inexhaustible energy resource?
a.
coal
c.
water
b.
oil
d.
natural gas

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

Some animals that try to adapt to climate changes eventually die due to starvation, as climate change alters the web.