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17 08, 2017

What is a Comet? – Astronomy – Space

By |2019-04-18T05:32:51-07:00August 17th, 2017|Physics|0 Comments

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 ice All our space articles When were the first comets? A nebula formed, and then most of the material in our nebula merged together, about [...]

26 06, 2017

What is jade? Metamorphic rock

By |2019-09-18T07:51:37-07:00June 26th, 2017|Geology|2 Comments

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 tell them apart using chemical tests and x-rays. Like quartz, both jadeite and nephrite are chains of silicon and oxygen atoms. Why is [...]

25 06, 2017

What is granite? Igneous rock

By |2019-07-15T09:46:19-07:00June 25th, 2017|Geology|0 Comments

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 come from? More about igneous rock All our geology articles Why is the rock called "granite"? Granite stairs on the Queens borough [...]