sand

Home » sand

What are sedimentary rocks? Shale and limestone

By |2018-10-03T09:50:54+00:00June 26th, 2017|Geology, History|

Sedimentary rocks: Limestone cliffs in Saudi Arabia Before sedimentary rocks When the Earth was first forming, about six billion years ago, there weren't any sedimentary or metamorphic rocks. The only rocks were igneous rocks like quartz. These formed when melted silica, carbon, and other molecules cooled off and stuck together. More about igneous rocks [...]

What is quartz? Igneous rock

By |2018-09-06T07:27:12+00:00June 26th, 2017|Geology|

What is quartz? A chunk of white quartz What is quartz made of? Quartz is an igneous rock made out of molecules of silicon and oxygen atoms held together in a crystal pattern. All of the silica and oxygen that make quartz came originally from the insides of stars, and it shot out [...]

Where do tomatoes come from? South America

By |2018-04-20T00:18:42+00:00June 23rd, 2017|Food, South America|

History of tomatoes: Wild tomatoes Wild tomatoes in the Andes The earliest tomatoes were little sour berries. They grew on low bushes in dry, sunny places in the Andes mountains in South America, beginning about 350 million years ago. Tomato plants are related to nightshade, which is poisonous. So the leaves and stems [...]

Clay, sand, and loam – Soil types

By |2018-04-19T14:45:39+00:00June 20th, 2017|Economy, Geology|

Soil types triangle All dirt is basically made of three different kinds of particles. These are clay, sand, and loam. Clay is very fine, small inorganic particles, worn down from rock. Sand is bigger, coarser particles, also from rock, often quartz or silica. Loam is organic particles (bits of dead plants). Geologists and [...]

How to build a pyramid – Ancient Egypt

By |2018-04-19T12:10:03+00:00June 13th, 2017|Africa, Architecture, Crafts, Egypt|

Pyramid project: building a sand pyramid A pyramid project Ancient Egyptian pharaohs, like Mayan lords, built pyramids because they're a pretty easy shape to build. Pyramids are especially easy to build if they are mostly solid piles of dirt or stone. That's what the early pyramids were like: mostly solid. Build a pyramid [...]

What is silicon? Atoms, elements, chemistry

By |2018-04-24T14:46:23+00:00June 2nd, 2017|Chemistry|

Diagram of a silicon atom When a red giant star is getting older and runs out of helium fuel, it starts to convert the oxygen atoms in the star into silicon atoms. All silicon is made this way, inside a red giant star. Silicon is heavier than oxygen, because oxygen has only eight protons [...]

Roundworms, sandboxes, and pets: a project

By |2017-05-27T20:58:03+00:00May 27th, 2017|Biology|

Sandboxes can carry roundworms Roundworms are a serious health problem today in North America, especially in warm places where the cold doesn't kill them in the winter. Roundworms make kids tired, and they can make kids get thinner because they don't feel like eating. Roundworms can even make kids go blind if they get [...]