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A planet with fewer active volcanoes would have more craters, as the ash and lava from volcanoes will cover existing craters.
A planet with active volcanoes will have fewer craters, as older craters will tend to be buried by lava and ash.
Lava emissions are found with all active volcanoes, although some volcano emit more lave than others.
The presence of a Lava dome is not really a good indication of danger. Many inactive volcanoes still have a lava dome. If a lava dome is present on an active volcano, and it is growing, it could signify a build up before an eruption.
Magma, a thick substance composed of liquid rock, crystals, and dissolved gas is found inside of active volcanoes. When this substance erupts out of a volcano, it is then called lava.
active
spewing out lava, destroying, and bringing new life
Both the Colima (19.512727, -103.617241) and the Popocatepetl (19.022222, -98.627778) are the most active volcanoes in Mexico right now (Dec 2016), spewing ash plumes and lava; however none of them have had a major eruption for the last decade or so, which would endanger millions of people around both volcanoes.
A planet with fewer active volcanoes would have more craters, as the ash and lava from volcanoes will cover existing craters.
A planet with active volcanoes will have fewer craters, as older craters will tend to be buried by lava and ash.
All volcanoes do have lava (magma), mostly in their young and early (ie, active) stages.
erupting
Two challenges that volcanologists face investigating volcanoes are access to the volcano and the heat involved. Volcanoes can be very unpredictable, spewing out gas, rocks, and fiery balls of lava. For those that can get close enough to the crater or lava flows, the heat can be enough to stop them in their tracks.
Lava emissions are found with all active volcanoes, although some volcano emit more lave than others.
No, volcanoes do not need lava to be volcanoes.
The presence of a Lava dome is not really a good indication of danger. Many inactive volcanoes still have a lava dome. If a lava dome is present on an active volcano, and it is growing, it could signify a build up before an eruption.
A ring of volcanoes surrounds the northern Pacific Ocean, some of which are active and spew lava and others of which are dormant mountain peaks.