Like many Americans, I well remember where I was when President Kennedy was assassinated.
I was home, sick, and watching television, sipping an endless stream of the chicken noodle soup that my mother always made for me when I was ill.
These form above hot mantle upwellings or plumes which rise from great depths.
As the plate overlying the plume moves away from the hot spot and a new volcano is formed, the previous one cools to become dormant and eventually extinct.
Several geologic aspects of the natural occurrence of rare earth elements strongly influence the supply of rare-earth-elements raw materials.
Historical oddities or anomalous news stories especially attracted my interest, lingering in my mind for years to come.Volcanic activity frequently occurs at the boundaries of the Earth's tectonic plates which are a series of large blocks moving between each other.The movement of these plates plays a significant role in the type of volcano formed, which influences its shape.Harmful effects: In healthy people with normal kidney function, a potassium intake from foods does not seem to pose potential for increased risk, because excess potassium is readily excreted in the urine.In people whose urinary excretion of potassium is impaired, a potassium intake below 4.7 g (120 mmol)/day is appropriate because of adverse cardiac effects.At subducting plate margins, one plate is pushed under a neighbouring plate as they squeeze together.