To build a Volcano, first, insert a terrain and level it correctly. After that use paint brushes to level up the land and form a volcano. Make sure the land is rocky. Next, you should level down the land on the top to form a crater. Add little details to improve your volcano. If you want to, add a particle system to make it look like there is gas spewing out of the top. You will have to play around with the particle start population, size, and colors. Set the background to black and place the directional light at a good angle. Play around with the intensity and colors till it looks good. The final step is to place your camera in position to aim perfectly at the volcano. After that, your volcano is ready!