A comet in the night sky What are comets made of? Comets are balls of leftover rock and ice in space. They started out when a star exploded into a supernova. What is a supernova? More about [...]
What is jade? Jade rock from Alaska Jadeite and nephrite Jade is really two kinds of metamorphic rock, jadeite and nephrite, that look pretty much exactly the same. Scientists can [...]
Granite rock What is granite? Granite forms when bits of quartz and feldspar shoot out of volcanoes, so it's one kind of igneous rock. What is quartz? Where does feldspar [...]
