Determining what causes the seasons is not as straightforward as determining what causes day and night. we can begin by suggesting hypotheses and then testing them for their validity. let’s start with the hypothesis that the seasons are caused by a variable distance between the earth and the sun. sort the observations or physical laws below according to whether they argue for or against this hypothesis.
a. closer light source has stronger intensity.
b. earth's closest approach to sun is in january.
c. earth's orbit is elliptical.
d. s and n hemispheres have opposite seasons

[fw.02]sinkholes are often formed as a result of the actions of. a.heat on recharge b.pressure on aquifers c.acid in groundwater d.minerals in hot springs

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.

The covers all of earth like a thin shell,but it is not a solid sheet of material.it is broken up into several large sections and many smaller ones. fill in the blank.