Which of the following is a discovery that supports the theory that there was once, or may still be, liquid water on planets other than Earth?
A. Life is present on Saturn and Mars, so therefore water must exist on those planets.
B. Jupiter experiences daily rainfall and has several small rivers.
C. There are river-like channels and rocks with an eroded appearance on Mars
D.
There are large ponds and lakes present on the surface of Mars

What is the mercury length of time for one revolution around the sun?

Look at the data above. provide an explanation for europe’s projected population decrease by the year 2050. (i'm doing this for future kids) the answer is : the percentage of people over the age of 65 and under the age of 15 in europe is currently the same at 16% each. therefore, the majority of the population is between the ages of 16 and 64. in forty years from now, in 2050, a greater percentage of the population will be over the age of 65. europe also has a relatively long life expectancy of 75 years. this, combined with a low birth rate means that by 2050 europe’s population will actually be less than it is today.

How does central place theory explain patterns in the size and distribution of cities?