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What Are the 7 Largest Countries in the World by Area?
science.howstuffworks.com/environmental/earth/geophysics/largest-countries-in-world-by-area.htm
The seven largest countries in the world account for nearly half of the world's land area, but one is far larger than the rest. Do you know what the largest country is?
What Are the 8 Phases of the Moon, in Order?
science.howstuffworks.com/phases-moon.htm
There are eight phases in the lunar cycle and the moon is in one of them every night. What are these phases of the moon?
What Are the Nitrogen Cycle Steps?
science.howstuffworks.com/life/biology-fields/nitrogen-cycle.htm
The nitrogen cycle is the system by which nitrogen is converted into different chemical forms, some usable to humans and animals and some not, as it circulates among the atmosphere, the land and the oceans.
What Are the Solar System Planets in Order?
science.howstuffworks.com/planets-in-order.htm
You know Saturn and Venus and Mars. Can you put the eight planets of the solar system in the correct order? There are several ways to do this.
What Came First, the Chicken or the Egg?
science.howstuffworks.com/life/genetic/question85.htm
It's a chicken-or-egg situation: What came first? Perplexed people need wonder no longer, as we've sussed out the answer to this ancient riddle.
What Caused the Dust Bowl?
science.howstuffworks.com/environmental/green-science/dust-bowl-cause.htm
What if the land you relied upon simply blew away? In the 1930s, poor stewardship and crushing drought created black blizzards and an internal American exodus known as the Dust Bowl.
What Caused the Mysterious Carolina Bays?
science.howstuffworks.com/environmental/earth/geophysics/carolina-bays.htm
Some say UFOs, while others say a meteor strike formed the Carolina Bays. Whatever created these isolated ponds and wetlands across North and South Carolina left a wondrous ecosystem that is in dire need of protection.
What Causes Mutations? Piecing Together DNA's Puzzling Edits
science.howstuffworks.com/life/genetic/dna-mutation.htm
DNA mutation can be caused by a wide variety of factors. Learn about some of the many causes of DNA mutation in this article form HowStuffWorks.
What Causes Seasons? Earth's Tilt and Orbit
science.howstuffworks.com/nature/climate-weather/atmospheric/question165.htm
What causes the seasons? Why are the seasons reversed in the Northern and Southern Hemispheres? And if the Earth moves in an elliptical orbit around the Sun, why don't we have two summers and two winters every year?
What Causes Thunderstorms?
science.howstuffworks.com/nature/climate-weather/storms/question646.htm
Thuderstorms occur more in the summer than any other month. Find out why thunderstorms occur more frequently in the summer.