Solve it

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Across
  1. 3. - The part of Earth’s crust that includes mountains and valleys (7 letters)
  2. 4. - The force that pulls objects toward the center of Earth (6 letters)
  3. 6. - A sequence where the difference between consecutive terms is constant (12 letters)
  4. 7. - A process of obtaining a substance from its solution (11 letters)
  5. 8. - The mathematical concept involving change in position (9 letters)
  6. 9. - The principle stating that energy cannot be created or destroyed (8 letters)
  7. 10. - The type of number that cannot be expressed as a fraction (6 letters)
Down
  1. 1. - The process of combining substances to make a solution (9 letters)
  2. 2. - The science of numbers and shapes (4 letters)
  3. 5. - The point where two lines meet (8 letters)