Howardites

The answer sheet for the worksheet Falls and finds. 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: Falls and finds

  1. D: About 40 to 50Only about 4 or 5 per cent of falls are irons, which is 40 to 50 in every 1,000.
  2. D: From years to hundreds of thousands of yearsFinds may be collected years, centuries or even hundreds of thousands of years after they landed.
  3. D: A fall, because it was detected coming downA fall can be detected by cameras, radar or sonic booms, not only by eyewitnesses, as long as it is then recovered.
  4. A: It can affect the results of chemical testsTerrestrial weathering can alter results, so scientists must know how much damage there is.
  5. A: Falls are noticed whatever they look likeBecause falls are spotted regardless of their appearance, they are not biased towards eye-catching types.
  6. True (They creep in through cracks)Over time, Earth chemicals can creep into a meteorite's cracks, which is part of terrestrial weathering.
  7. True (Nogata, in Japan, in 861)Nogata fell in Japan in 861 and is the oldest fall with surviving material.
  8. Cameras, radar or sonic booms can detect it coming down (accept any answer with the same meaning)A fall can be filmed, picked up on radar, or heard as a sonic boom followed by fresh stones.
  9. The one found after 50,000 years (accept any answer with the same meaning)The longer a find has been on Earth, the more careful scientists must be with its chemistry.
  10. What Earth actually receives from space (accept any answer with the same meaning)Falls are noticed regardless of type, so their mix reflects what really arrives.

Task

Answers will vary. The task comes from the lesson: Make a two-column table headed Falls and Finds. As you go through this course, add each named meteorite to the correct column. By the end you will have your own catalogue.

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

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