The earth's climate has gone through big changes in the past. What's going on right now?

Part of a 24-book series that covers the four main branches of science: physical science, life science, earth and space science, and science and technology, and covers essential content standards. Students will build their scientific knowledge, increase their content vocabulary, and sharpen critical nonfiction comprehension skills. Books are 6 5/8" x 9 1/8"