Solve the puzzle

12345678
Across
  1. 2. used to draw carts
  2. 3. a renowned biologist
  3. 7. small stones
  4. 8. an alloy of copper and tin
Down
  1. 1. huge blocks of stones
  2. 4. a means of getting food
  3. 5. a kind of stone that chips easily
  4. 6. used to make needles blades and other tools