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Slate splits into sheets and is used on roofs.
crystal
Convex . . . "curved out", like the outside of a balloon, the outside of a smooth hubcap, and the top of a half-eaten ice-cream cone. Concave . . . "curved in", like the top of the ice-cream in the tub after the first five cones have been scooped out, the mark a rock makes in snow, and the inside of a soup bowl.
ROCK
3kg rock = 3000 g rock; so it is heavier because it weighs more. hoping kids use this!