Block · one region of the page, as the scanner read it. It may hold a whole story, part of one, several, or an advertisement; stitching blocks into articles is the next step. Text is supplied OCR.
Page 2 · column 5 of 9 · from the scan, no model involved
Others have formed as lava cooled after volcanic eruptions or as waves chiseled away at cliffs. Limestone caves are produced by weak carbonic acid formed when carbon dioxide from decaying vegetation dissolves in water. The acidic water seeping into cracks gradually dissolves the rock with spectacular results: The world’s largest cave room in New Mexico’s Carlsbad Caverns, measuring 4,000 feet long, 625 feet wide, and up to 285 feet high.
A 60-foot stalagmite built up of mineral-rich water dripping for three billion years onto the floor of Cathedral Caverns in Alabama. A system of connecting chambers possibly 100 miles long at Mammoth and Flint Ridge cave systems in Kentucky.
MAh .^ijd'Ciive jnAmerica . The first human visitors braved the cave darkness in search of shelter possibly 20,000 years ago, according to tests of spearheads
93.4%