Chapter 15.4 By Austin Fisher and Julian Benali

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Across
  1. 2. the theory that states that combined cyclic changes in Earth's position are the underlying cause of ice ages.
  2. 3. ______ ________ in the atmosphere keeps Earth warm by absorbing the heat that Earth radiates and releasing it in random diretions.
  3. 4. the amount of _____ _____ absorbed by Earth's surface affects global temperatures.
  4. 5. the river that allows the Great lakes to drain into the Atlantic Ocean.
  5. 7. The process of covering with ice or a glacier
  6. 9. When a deposit of till cements together it forms a rock called ____
Down
  1. 1. evidence for ancient ice ages is found in ancient _______ _________ that have hardened into rock
  2. 6. Long periods of glaciation.
  3. 7. During the most recent ice age, the _____ _____ were formed.
  4. 8. The tilt of the Earth's ______ changes over time.