The Mercalli scale measures the intensity of an earthquake. It measures the effects of an earthquake, and is distinct from the moment magnitude usually reported for an earthquake.
A common rock type found within oceanic crust is called basalt rocks. It is dark just like an igneous rock and it is basically a type of lava from a volcano.
Weathering is the best short term effect of water erosion. This causes the rocks to break down because of the water filling inside the cracks on the rocks. This might be reduced through using damps or conserving water. Too much of water spillage will cause water erosion. It is important for people to know how to conserve water in order to be safe from the long term effect of water erosion.
