Ice is water in its frozen, solid form. Water freezes at zero degrees Celsius. Expanding water molecules create pressure, breaking rocks. Ice floats due to its lighter density than liquid water
Global temperature drop occurred 8,200 years ago, lasting 2-4 centuries. Heinrich Zoller first identified it in 1960 as Misox oscillation. Event caused atmospheric methane levels to drop by 80 ppm
Roland Emmerich directed 2004 science fiction disaster film based on 1999 book. Filmed in Montreal, Toronto, New York, and Tokyo between 2002-2003. Released May 28, 2004, grossed $552 million worldwide
Mars' average temperature is minus 80 degrees Fahrenheit. Maximum temperature reaches 70 degrees Fahrenheit near equator. Nighttime temperatures can drop to minus 100 degrees Fahrenheit. Mars' atmosphere is 95 percent carbon dioxide
Geography means "earth writing" and studies Earth's natural features and human-environment interactions. Ancient Greeks coined the term, Islamic Golden Age brought groundbreaking discoveries. Marco Polo led European Age of Discovery for trade and exploration. Geography became university discipline in 18th Century. 20th century brought technological advancements like satellite and computer systems
Antarctic ice constantly moves, with 90% of mass below water surface. Icebergs are larger than 5m across and 30m thick. USNIC monitors all Antarctic icebergs larger than 1650m