Excerpt from A Text-Book of GeologyStructural geology explains the composition of rocks and the forms in which they occur. Thus some rocks are sandstones or limestones, others are slates or schists, and others are ancient or modern lavas. These occur in beds or masses of many kinds, and have often been folded, broken, or otherwise changed. As a result of composition, structure, and dynamic changes we have land forms, the study of which is included in Part II.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.