Shale is a fine-grained sedimentary rock that forms from the compaction of silt and clay-size mineral particles that we commonly call mud.This composition places shale in a category of sedimentary rocks known as mudstones.hale is a rock composed mainly of clay-size mineral grains. These tiny grains are usually clay minerals such as illite, kaolinite and smectite. Shale usually contain other clay-size mineral particles such as quartz, chert and feldspar.
Extremely draught resistant Opuntia cactuses form arid shrub forests in the lowlands, particularly on the larger islands, like Santa Cruz. At higher elevations, the climate of the Galapagos Islands, Ecuador, is cooler and with more rainfall. As a result there is true forest on the higher mountains thanks to the cooling of the air as it is forced up. When the air cools off, the humidity in the air condenses, thus forming clouds.
Galapagos Weather - When to Go. When it comes to booking a great vacation, it isn't just your own schedule that can place constraints on when you can go -- some places are simply seasonal. Fortunately for travelers everywhere, the Galapagos Islands aren't one of those places. Thanks to their remote position that straddles the equator, the Galapagos are a joy to tour no matter when you go. Still, there are some considerations to keep in mind in regards to the advantages of choosing one time to visit over another.