It is hotter upstairs because heat rises up and gets trapped in the highest point of the building or structure.
The answer is A.it forms on the earths surface
<span>There are 19 States that are completely north of 40 degrees north latitude or otherwise known as the 40th parallel. The states that are north of the 40th parallel are as follows from west to east; Washington, Oregon, Idaho, Montana, Wyoming, North Dakota, South Dakota, Nebraska, Minnesota, Iowa, Wisconsin, Michigan, New York, Connecticut, Rhode Island, Massachusetts, Vermont, New Hampshire and Maine.</span>
Outer core.
The densest layer is the inner core but it is not given as an option. The outer core is closet to the inner core, therefore it is the correct option.
