Answer:
Mantle convection currents, ridge push and slab pull are three of the forces that have been proposed as the main drivers of plate movement (based on What drives the plates? Pete Loader). There are a number of competing theories that attempt to explain what drives the movement of tectonic plates.
Explanation:
The statement that describes how many icons you would expect on a map is Several icons in areas with high population density.
<h3>Where would map icons be found on a map?</h3>
Map icons are used to show the various cultural and other major resources that an area has.
These resources are usually concentrated in the urban areas of a country and so you would find several icons in areas that have high population densities as these are urban areas.
In conclusion, several icons will focus on places with high density.
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Answer and Explanation:
A hydro-thermal vent can be defined as a crevice on the floor of the sea from which water heated by geothermal energy erupts or issues. These vents are common near places that are volcanically active, areas where the movement of the tectonic plates is away from the spreading centers, hotspots, ocean basins,etc.
Marine researchers know the sites for hydro-thermal vents by computing the exact location of the place of active volcanic sites which provides the movement to the the tectonic plates which in turn produces gas and undergo some thermal processes making it easily detectable for the location of thermal vent sites.
They can be sure of finding a vent by calculating the activeness of active volcanic sites in the hydrological places.