Intrusive igneous rocks are formed from magma that cools and solidifies within the crust of a planet, surrounded by pre-existing rock (called country rock); the magma cools slowly and, as a result, these rocks are coarse-grained.The mineral grains in such rocks can generally be identified with the naked eye.Intrusive rocks can also be classified according to the shape and size of the intrusive body and its relation to the other formations into which it intrudes.Typical intrusive formations are batholiths, stocks, laccoliths, sills and dikes.
Hypabyssal rocks are less common than plutonic or volcanic rocks and often form dikes, sills, laccoliths, lopoliths, or phacoliths.
In one day, our infinitely wise, all-powerful Creator laid down some dirt layers 30 miles thick that are now deep in the geologic record and foundational to the landmasses we live on.
These provide us with an abundance of resources, which we use to worship and serve Him for His purposes and glory.
Black smokers and mid-ocean ridge basalt are examples of submarine volcanic activity.
The volume of extrusive rock erupted annually by volcanoes varies with plate tectonic setting.