general information ?!

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Across
  1. 2. hour. What beats without a heart?
  2. 5. The strongest and most solid types of stones, called?
  3. 6. There is a predatory animal. If it gets hungry, it eats its young. What is the name of this animal?
  4. 7. What is the percentage of water in the globe?
Down
  1. 1. What does the term black gold refer to?
  2. 3. Who is the animal today that loves to chase mice?
  3. 4. What is the old name of China?