A cave is a hollow place in the ground, specifically a natural underground space large enough for a human to enter. Caves form naturally by the weathering of rock and often extend deep underground. The word cave can also refer to much smaller openings such as sea caves, rock shelters, and grottos, though strictly speaking a cave is exogene, meaning it is deeper than its opening is wide, and a rock shelter is endogene. A cavern is a specific type of cave, naturally formed in soluble rock with the
By Michael B. Rappaport and David A. Strauss. Article V of the Constitution says how the Constitution can be amendedâthat is, how provisions can be added to the text of the Constitution. The Constitution is not easy to amend: only twenty-seven amendments have been added to the Constitution since it was adopted. Article V spells out a few different ways in which the Constitution can be amended.
Article V of the Constitution prescribes how an amendment can become a part of the Constitution. While there are two ways, only one has ever been used. All 27 Amendments have been ratified after two-thirds of the House and Senate approve of the proposal and send it to the states for a vote. Then, three-fourths of the states must affirm the proposed Amendment. The other method of passing an amendment requires a Constitutional Convention to be called by two-thirds of the legislatures of the States. That Convention can propose as many amendments as it deems necessary. Those amendments must be approved by three-fourths of the states.