SOLAR SYSTEM

Detailed explanation-1: -And because Mars has no plate tectonics, the crust where the volcano first erupted never moved away from the volcanic source. The result was a huge and heavy stack of lava rock. Moreover, the volcanic activity that built Olympus Mons, also built numerous other big volcanic structures nearby.

Detailed explanation-2: -Mars, too, has many other types of volcanoes, including the biggest volcano in the solar system called Olympus Mons. Olympus Mons is 100 times larger by volume than Earth’s largest volcano of Mauna Loa in Hawaii, and is known as a “shield volcano, ‘’ which drains lava down a gently sloping mountain.

Detailed explanation-3: -Because the lower gravity of Mars generates less buoyancy forces on magma rising through the crust, the magma chambers that feed volcanoes on Mars are thought to be deeper and much larger than those on Earth. If a magma body on Mars is to reach close enough to the surface to erupt before solidifying, it must be big.