Igneous rock is one of the three main rock types based on the method of its formation. It is also referred to as platonic or volcanic rock depending on where it formed. In a nutshell, to be classified as igneous, a rock must have crystallized and solidified from molten rock (magma) either below ground (intrusive … Read more

The oldest known civilization is that of ancient Sumer. Sumerians developed a thriving agricultural society by the 6th millennium BECE, complete with great stone buildings and even some conveniences that we consider 'modern'. Theirs predates any other civilization by at least a few hundred years. Lemuria is considered fictional.   **If literature is the mark … Read more