Lesson 3.4 Vocabulary

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Across
  1. 3. This cycle is critical as it's a component in ATP, DNA, and phospholipids in cell membranes.
  2. 5. this type of cycle is the movement of a particular chemical through the biotic and abiotic components of an ecosystem.
  3. 6. About 78% of Earth’s atmosphere is composed of
Down
  1. 1. Under certain conditions, the burial process stores that carbon in Earth's crust where, over millions of years, it becomes.
  2. 2. is present in most chemical compounds that make up living things, called this cycle.
  3. 4. this cycle is also known as the water cycle.
  4. 7. a product of photosynthesis that is released into the atmosphere in this cycle.