Volcanoes form when magma rises through cracks or weaknesses in the Earth's crust. Pressure builds up and magma explodes to the surface causing a volcanic eruption. The lava from the eruption cools to form a new crust. After several eruptions, the rock builds up to form a volcano. Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface. Over time as the volcano continues to erupt, it will get bigger and bigger. Many volcanoes are located along the Earth's plate boundaries. Active volcanoes are rare in Australia because there are no plate boundaries there. A canyon is a narrow, steep-walled, and deep valley with or without a stream or river. A canyon is a deep canyon between pairs of bluffs or cliffs
