Draw a linear scale for a length of 500km showing 100km in the primary division and 20 km in the secondry division when the R.F is 1:500000
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However, old craters can be eroded by new impact events. Mercury and the Moon have very old surfaces. One of the youngest large craters on the Moon is Tycho, which was formed about 109 million years ago. ... Three images of Tycho crater and its central peak, located at 43 S, 11 W, on the Moon.
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