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Q1.
An active volcano will have at least one eruption in the last few thousand years. So , volcano hasn't erupted in the last few years, but scientists think it will erupt again . Hence , Volcanoes called active volcanoes even when there is no eruption.
Q2.
Aftershocks can be used as "echo sounders" to study the local structure of the earth.
Seismologists and geologists can find the orientation of the fault plane -
which helps enormously in characterizing the earthquake, and the stresses and strains within the Earth that caused it.
Q3.
Most tsunamis are generated by shallow, great earthquakes at subductions zones.
When a great earthquake ruptures, the faulting can cause vertical slip that is large enough to disturb the overlying ocean.
Thus, Earthquakes generates a tsunami that will travel outwards in all directions .
ans 1 . active volcanoes have a recant story of eruption ; they are likely to erect again.... inside an active volcano is it chamber in which molten Rock, called magma , collect . pressure builds up inside the Magma chamber to move through the channels in the rock and escape into the planet surface.
ans 2 .