Know how scientist can determine the depths of earths layers?

What are the disadvantages of using a computerized database? When groundwater is pumped from a well it is replaced by these two process? Convection ridge push and slab pull work together to produce? What paleoclimatic evidence supports continental drift? What is the lower heating value of carbon dioxide? What would the weather be like in Wisconsin if the earth was not tilted on its axis 23.5 degrees? Why does the wind blow? At what time of day does snow usually fall? What is a partial rainbow called? Pyroclastic flow would be most likely in what kind of eruption? Where is air pressure the least? What causes air pollution in Mumbai? Why are cyclones given names? What temperature is 15 degrees less than 6 degrees celsius? What do hurricane hunters drop into hurricanes to measure wind temperature and pressure? What is the area of the land that is periodically underwater or whose soil contains a great deal of moisture? How is a river source formed? What type of weather is associated with warm front? What element is responsible for the cloudy solution in the silver nitrate test? The changes in seasons are caused by earths what.?

Know how scientist can determine the depths of earths layers?