I NEED HELP!! Stretching from Canada to Mexico, the are the longest mountain range in the United States. The Rio Grande, Missouri, and Mississippi are major in the United States. The United States is bordered by the to its east.

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

When you cross a time zone going east, what happens to the time

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.