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 [...]
A feldspar rock quarry in India Is feldspar rare? Feldspar is a very common igneous rock. More than half of the Earth's crust is made of feldspar. What are igneous [...]
Soil types triangle What is dirt made of? All dirt is basically made of three different kinds of particles, as Aristotle and his student Theophrastus saw in the 300s BC. [...]
History of Straw: loose straw in a pile What is straw made of? Straw is the dried stalks of tall grasses like wheat, millet or barley. After people harvested the [...]
Early sealing from West Asia About 3000 BC, as people started to live in cities and the world got more crowded, they also started to want a way to mark [...]
Cuneiform tablet, made by kids at Laurelhurst School, Portland Oregon About 3500 BC, people in West Asia began to use writing. Because nobody had invented paper yet, these people wrote [...]
Molded bricks project: A bull from the Ishtar Gate, Babylon (600s BC) Why molded bricks? Architects in ancient Mesopotamia (West Asia) didn't have much good stone to carve, but they [...]
Clay seal project: A cylinder seal and square seal from ancient Mesopotamia What is a clay seal? The people of ancient Mesopotamia had many baskets which had been sealed with [...]
Chinese terracotta army head made by kids at Laurelhurst School, Portland Oregon In the Qin Dynasty, about 210 BC, one of the emperors had a whole army of men made [...]
Terracotta warriors The Qin Dynasty didn't last very long (only 15 years) and so there wasn't time to develop any special style of art. Mostly even experts can't tell Qin [...]
