The Venus geography is a unique feature of Venus as volcano-shaped pancakes. This seems to be caused by the eruption of very thick lava. And the collapse of the dome caused by the pressure of the fluid mantle beneath the surface of Venus, called coronae, which has a diameter of up to about 100-600 km area has some common characteristics streak him or his streak. spread in a circle around the volcano called radial arachnoids which such characteristics found only on the surface of Venus only.