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Tephra is the general term now used by volcanologists for airborne volcanic ejecta of any size. Historically, however, various terms have been used to describe ejecta of different sizes. Fragmental volcanic products between 0.1 to about 2.5 inches in diameter are called lapilli; material finer than 0.1 inch is called ash. Fragments larger than about 2.5 inches are called blocks if they were ejected in a solid state and volcanic bombs if ejected in semi-solid, or plastic, condition. In a major explosive eruption, most of the pyroclastic debris would consist of lapilli and ash. Volcanic bombs undergo widely varying degrees of aerodynamic shaping, depending on their fluidity, during the flight through the atmosphere. Based on their shapes after they hit the ground, bombs are variously described, in graphic terms, as "spindle or fusiform", "ribbon", "bread-crust", or "cow-dung".
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What happens when the sun heats ground water?
When the sun heats ground water it evaporates into the atmosphere, then it condensates back into droplets, and then falls as rain back into the ground. It is a never ending cycle and is quite unique.
What is it called when rain falls to the ground and flows into surface water and is six letters and begins with a r?
runoff
What is ground movement?
brunnett beauty: What is ground movement? I believe ground movement is the plates moving in the earth just like how earthquakes form by plates in the ground colide to make movement in the earth.
What do you call the particles produced in volcanic eruptions?
tephra, ash, cinders, bombs, blocks, etc. depending on size.
What kind of feature will it form if the the magma chamber empties beneath a composite volcano and then collapses?
It falls down
