Instant Scouting Magazine Oct/Nov 2013 - Learn about the creation of craters.
A tray, half-filled with sand; cardboard tube for safely directing, dropping and rolling "meteorites" into the sand. A wrapping paper tube is ideal; Ruler/metre stick; a bag of flour; a pot of cocoa; a jug of water; variety of meteorites (eg marbles, rubber balls, stones)
Fill tray with sand. Use tube to drop meteorites directly onto the sand one by one to make craters. See file.