Mount Gamkonora is stratovolcano which erupted
in 2007. It is located on Halmahera island in Indonesia. It has shifting eruption centres which has lead to an elongated series of craters along N-S trending rift.
Which of the following predominantly acts as the agent of chemical erosion of soil?
Underground water predominantly acts as the agent of chemical erosion of soil. Chemical weathering changes the molecular structure of rocks and soil. The important characteristics of surface conditions that lead to chemical weathering are the presence of water (in the air and on the ground surface), the abundance of oxygen, and the presence of carbon dioxide, which produces weak carbonic acid when combined with water.
In which type of rocks are coal and petroleum found?
Sedimentary rocks make up most of the rocks on the earth and are formed when bits of rock, soil or organic matter settles and accumulates. Plant and animal fossils can be found in sedimentary rock. When there is an abundance of plants and animals, fossil fuels develop, like oil, natural gas and coal.
Who gave the idea that originally there was only one continent called Pangea ?
P-wave, S-wave, L-wave is the proper order of seismic waves as they are received at seismograph station. The first kind of body wave is the P wave or primary wave. This is the fastest kind of seismic wave, and, consequently, the first to 'arrive' at a seismic station. The P wave can move through solid rock and fluids, like water or the liquid layers of the earth. It pushes and pulls the rock it moves through just like sound waves push and pull the air. The second type of body wave is the S wave or secondary wave, which is the second wave you feel in an earthquake. An S wave is slower than a P wave and can only move through solid rock, not through any liquid medium. The first kind of surface wave is called a Love wave, named after A.E.H. Love, a British mathematician who worked out the mathematical model for this kind of wave in 1911. It's the fastest surface wave and moves the ground from side-to-side.