Earth How-Igneous Rocks

When volcanoes erupt, hot lava drips on the side of volcanoes then cools and hardens. This becomes igneous rocks like granite. Igneous rocks can also form deep inside the Earth from magma. Arguably, the start of the rock cycle begins when molten rock cool from volcanoes. Because without igneous rocks, there wouldn’t be the rock cycle

Earth How-Rock Cycle

First, rocks would sink deep down into the interior. Then, they would rise back up again as magma. All thanks to the mechanism of plate tectonics. Like a well-oiled machine, rocks transform from igneous, sedimentary to metamorphic types. This process where rocks are created, altered, and formed again is the rock cycle. If you look at the Earth’s crust, it’s composed of 80% igneous, 15% metamorphic, and 5% sedimentary rocks. But 75% of our land surface contains sedimentary rocks.