Olympus Mons is the name of the biggest volcano and largest mountain in our solar system. The word mons means in Latin mountain and Olympus is the biggest mountain in Greece, It is found in the red planet mars. Its altitude is 26 km which makes it 3 times higher than Everest. Unlike Everest, Olympus mons has a very gentle slope. The diameter of the base is about 550km. It is formed from thousands of basaltic repeated lava flow. Since, the planet’s crust is hardly in motion it helped the lava to accumulate.