Tag Archives: Rock

What is oil shale?

Oil shale is a kind of rock that contains kerogen, a waxy substance that gives off liquid when heated.  Not all oil comes from oil wells that bring oil up from underground pools. Much of the world’s supply of oil is  found in a kind of rocks formed of tightly packed clay, mud and slit.  …

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How is marble formed?

Marble comes from limestone that has been changed by heat and pressure. The rock we call marble is really made-over limestone – it is a metamorphic rock.  That is, it began as one kind of rock and later changed into another kind. Ages ago the skeletons and shells of countless billions of tiny sea creatures …

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What is a dune?

A dune is a hill or mound of sand drifted by the wind. A dune is a hill of sand.  Dunes are round along sandy shores of lakes and oceans and in sandy deserts. They are built by the wind.  At the wind blows, it piles the sand into hills that often look like ocean …

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What keeps the sun shining and how long can it continue to do so?

The Sun is a huge ball of extremely hot, glowing gases.  It is considered as the star nearest to the Earth.  It’s mass is equivalent to 333,420 earth. The surface temperature of the sun is estimated to be between 5 000 oC to 6 000 oC.  Temperature at the core is as high as 14 …

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What is a shooting star?

Shooting stars are tiny meteors that glow white hot when they hurtle from out of space into the earth’s atmosphere. If you look up at the sky long enough on a dark, clear night, you may see the fiery streak of a “shooting star” flash across the sky. While “shooting star” may be a pretty …

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What does the inside of the earth look like?

Beneath the earth’s rocky crust are the hard mantel, hot liquid outer core, and the solid metal inner core. Have you ever tried to dig a deep hole—maybe all the way to the other side of the world?  Of course, you could dig only a few feet.  But suppose you could dig a hole straight …

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