Silica may not be a word you commonly hear associated with diet (or foods that prevent hair loss, for that matter). If youâre looking to promote hair growth and prevent hair loss, however, silica will need to be on your menu.
keystone-the central building block at the top of an arch or vault. headstone, key. arch - (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it. building block-a block of material used in construction work.
Sponsored Topics. Pennsylvania, geographical center of the nation's 13 original colonies, is known as the Keystone State. From the Delaware River to the western Allegheny Mountains and Lake Erie, travelers can explore national landmarks such as Independence Hall, Valley Forge, and Gettysburg. The state likewise overflows with bucolic natural beauty and big-city bustle.