Howardites

The answer sheet for the worksheet Craters: when big rocks hit. 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: Beginner · Ages 7 and upAnswer sheet for teachers

Answers: Craters: when big rocks hit

  1. B: About 170 metresMeteor Crater is roughly 170 metres deep and about 1.2 kilometres wide.
  2. C: Much wider than the rockThe shock wave digs a bowl-shaped hole much wider than the space rock itself.
  3. B: Earth is biggerEarth has been hit just as often, in fact more often, because it is the bigger target.
  4. D: The rock is too big and heavy for the air to stopA rock many metres or more across is so big and heavy that the air cannot brake it, so it slams into the ground.
  5. False: the right answer is Rivers filling holes with mudRivers carry away soil and fill holes with mud, slowly hiding craters.
  6. True (Canyon Diablo meteorites)Many iron pieces, known as Canyon Diablo meteorites, have been found around Meteor Crater.
  7. An iron meteoroid (accept any answer with the same meaning)Meteor Crater was made by an iron meteoroid perhaps tens of metres across.
  8. Rock thrown out of the hole lands around it (accept any answer with the same meaning)Rock blasted out of the hole lands around it and builds a raised rim.

Task

Answers will vary. The task comes from the lesson: Fill a baking tray with flour and sprinkle a thin layer of cocoa powder on top. Drop marbles or small balls from different heights and look at the craters, the rims and the splash of flour. Clear up together afterwards!

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

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