Howardites

The answer sheet for the worksheet Meteorites from the Moon and Mars. Each answer comes with the reason, so it can be used to mark or to go over the questions with the class.

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Start here: Explorer · Ages 10 and upAnswer sheet for teachers

Answers: Meteorites from the Moon and Mars

  1. D: Surface rocks at the edge of the impactSurface rocks near the edge of the impact zone can be sped up quickly with relatively little shock.
  2. A: About 2.4 km per secondThe Moon's escape velocity is about 2.4 kilometres per second.
  3. D: NakhlaNakhla fell in Egypt in 1911 and gave the N in SNC.
  4. B: Mars stayed volcanic long after asteroids cooledYoung volcanic rocks show that Mars still had molten rock long after the asteroids had cooled.
  5. C: They are broken fragments cemented togetherA breccia is a rock of broken pieces stuck together, common on the heavily cratered highlands.
  6. False: the right answer is The bright highlandsMany highland rocks are pale breccias rich in plagioclase feldspar.
  7. False: the right answer is AntarcticaAllan Hills 81005 was found in Antarctica in 1982.
  8. Water once acted on rocks on Mars (accept any answer with the same meaning)Minerals formed by water on Mars show that water was present there at some time.
  9. The Moon's escape velocity is lower (accept any answer with the same meaning)A rock must beat about 2.4 km/s to leave the Moon but about 5 km/s to leave Mars.
  10. Volcanic rocks (accept any answer with the same meaning)Martian meteorites are mostly volcanic rocks.

Task

Answers will vary. The task comes from the lesson: Model how impacts launch rocks: press your thumb into the side of a ball of play dough and watch how material at the edge is pushed outwards. Discuss why rocks at the edge would be shocked less.

Look for work that uses the key words correctly and gives a reason for each point.

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