Did you know that "megalith" means "big rock", which is certainly a good description of Stonehenge?
Earth and Space Science Concept of the Day
Do you know what this word or phrase means?
Ooids
xOoids : Small (< 2 mm), spheroidal, layered sedimentary grains, usually composed of calcium carbonate, but sometimes made up of iron- or phosphate-based minerals.
Scientists have been taking a close look at special types of bacteria that live in the ocean. These microbes may be tiny, but they play a big part in the nitrogen cycle. The little round bacteria are able...Read more