Pick up a rock. Is it heavy or light, sparkling with the tiny crystals, or a cold lump of volcanic material? Could it be a nickel-iron meteorite that hit the earth from outer space back when dinosaurs still roamed the planet?
Pick up a rock. Is it heavy or light, sparkling with the tiny crystals, or a cold lump of volcanic material? Could it be a nickel-iron meteorite that hit the earth from outer space back when dinosaurs still roamed the planet?