The Ice Ages

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Across
  1. 4. the saber-tooth ______ was related to the smilodon
  2. 7. person who theorized cycles of ice ages
  3. 8. during summer this affects how much ice melts
  4. 9. the Earth's _______ is not a circle but an ellipse
  5. 10. the ice throws back heat without absorbing it
Down
  1. 1. the glyptodon is a relative of
  2. 2. the animals during the ice age no longer exist so they are considered
  3. 3. how close or far Earth is from the Sun
  4. 5. study the bones of ice age animals
  5. 6. had curvy tusks and was related to mastadons
  6. 11. where ice forms more easily than water
  7. 12. the angle of the Earth's axis