What is plate tectonics? Earthquakes and volcanoes
Plate tectonics: The world as seen from space (flattened out) The continents move around When you look at a map of the world, it seems as though it was always [...]
Plate tectonics: The world as seen from space (flattened out) The continents move around When you look at a map of the world, it seems as though it was always [...]
What is flint? Flint is a sedimentary rock made out of an igneous rock. What is flint made of? It's pretty complicated. Billions of years ago, silicon and oxygen atoms [...]
Where ibn Sina came from: Uzbekistan Ibn Sina and the Samanids in Uzbekistan Ibn Sina (known to Europeans as Avicenna) was a scientist. He was born about 980 AD in the north-eastern part of [...]
Volcano erupting Volcanoes are places where the plates of the Earth's surface have cracks in them, so that the very hot melted rocks that are under the tectonic plates bubble [...]
Evaporated sea salt Salt molecules are a combination of chlorine atoms and sodium atoms. These atoms mix together easily and, once they are mixed, the salt molecule is very stable [...]
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 [...]
Erosion of a cliff in Canada Igneous rocks came first When the Earth first formed, about four and a half billion years ago, it was all liquid rock and liquid [...]
Salt water and ice: A salt truck spreading salt on the road Why do people put salt on the roads? You can easily see that salty water freezes at a [...]
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 [...]
What is metamorphic rock? Slate rocks in Cascadilla Gorge, Ithaca, New York Metamorphic rocks form under pressure About 450 million years ago, some of the sedimentary rocks began to transform [...]