Ever wonder what those rocks that fly out of volcanos are called and how they are formed? This kit will reveal those secrets. You will learn what causes obsidian to become pumice, how ash is welded into a rock, and why some eruptions produce mountains that are thousands of feet high while others produce lava flows that are thousands of acres wide. Kit includes10 volcanic rocks and 10 hands-on geology labs with all the materials you need to engage your mind, plus a 48-page lab guide with full instructions.
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