Where is the biggest cave on Earth? What causes the northern lights? Scientists begin their investigations by asking questions about the world around them. Are Icebergs Salty? will explore fascinating questions about Earth and inspire you to think like a scientist. Features include author/illustrator biography, comprehension questions, educational front/back matter, full-color photographs, glossary of key words, index, informative sidebars, note to parents and educators, and table of contents. Downloadable Teacher Notes available.