No. Calderas form when a volcano produces an extremely massive eruption and collapses in on itself. But the volcano will often continue to erupt after this. For example, the volcano Krakatoa formed a caldera in 1883, but eruptions since then have formed a new island that is currently very active. There is evidence that the volcano has done such a thing several times.
Some calderas have become lakes such as Crater Lake and Lake Taupo, but not all. A number of calderas such as the Valles Caldera in New Mexico or the Mount Tambora caldera in Indonesia. Some other calderas have not become lakes but have filled with seawater. Examples include Campi Flegrei in Italy, Santorini off the coast of Greece, and Krakatoa in Indonesia.
A caldera generally forms when a volcano produces a very large, violent eruption. So much magma is drained from below that the volcano collapses into the space left behind.
yes they can also form rainbows
Calderas
That term is 'calderas'
lakes form on the floor of a rift valley
Rock does not melt in calderas. It melts in the upper mantle.
Calderas can be occupied by lakes, but they do not have to be. Seomve calderas are dry while others are located beneath the sea.
One of the most famous is Crater Lake, Oregon. (see the link below)
yes they can also form rainbows
Calderas
Nigeria has no calderas.
Nobody dislikes aleandria calderas.
Don't no
That term is 'calderas'
lakes form on the floor of a rift valley
lakes form on the floor of a rift valley
the lakes and rivers form together and make rivers and lakes and that is what form the fjords
Calderas