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Your search for "sea level" returned 743 results
Electric Boats Make Emission-free Sea Travel a Reality
science.howstuffworks.com/transport/engines-equipment/electric-boats.htm
Electric-propelled boats, which are much quieter and more environmentally friendly than gas-powered motorboats, are finally beginning to hit the waves and find their market.
How Narwhals Work
animals.howstuffworks.com/mammals/narwhal.htm
Narwhals, the unicorns of the sea, are unusual tusked whales who like icy ocean waters. See what else makes narwhals interesting whales indeed.
6 Least-visited Countries in the World
history.howstuffworks.com/world-history/least-visited-countries-in-the-world.htm
When most people dream of travel, they think of popular tourist destinations packed with iconic landmarks and crowded attractions. But the least-visited countries in the world offer something different: raw natural beauty, rich culture, and a chance to explore without the tourist crowds.
Wind Energy Quiz
play.howstuffworks.com/quiz/wind-energy-quiz
Feel that wind? Fwooooshhhh!!! Fwwwooooshhh!! Quick, somebody put up a wind turbine. Test your knowledge with this quiz.
What would it take to reverse global warming?
science.howstuffworks.com/environmental/green-science/reverse-global-warming.htm
To reverse global warming we would have to start by reducing our carbon emissions. Learn more about what it would take to reverse global warming.
How Much of a Geographic Whiz Are You?
play.howstuffworks.com/quiz/how-much-a-geographic-whiz-are-you
Do you know your global places and local areas of interest? Get out your maps and wits, combine them and have fun in our Geography Whiz quiz!
The Most Dangerous Airport in the World, Plus 12 Nail-biters
science.howstuffworks.com/transport/flight/modern/scariest-airports-landings-takeoffs.htm
Fear of flying? Here are 13 airports where location, terrain, weather and design limitations make takeoff and landing a challenge for pilots and a nail-biter for passengers.
10 Starfish Species You've Probably Never Seen Before
animals.howstuffworks.com/marine-life/starfish.htm
What lives in water, has no gills, scales or fins and is not a fish? Yep, a starfish - which is why marine biologists have renamed these creatures sea stars.
How Deep Is the Ocean?
science.howstuffworks.com/environmental/earth/oceanography/how-deep-is-ocean.htm
The ocean is so deep, it puts the height of Mount Everest to shame.
Are Polar Bears Endangered?
science.howstuffworks.com/environmental/green-science/polar-bear-global-warming.htm
Polar bears and global warming are getting attention from conservationists and the general public. See why polar bears are threatened by global warming.