Earth's Systems
- Environment
Explainer: How and why fires burn
A fire’s colorful flame results from a chemical reaction known as combustion.
- Earth
Earthquake-triggered lightning?
An experiment with beads offers support for the claim that a rare type of lightning may accompany some quakes.
- Earth
Intel STS finalist takes on arsenic poisoning
Concerned about arsenic poisoning in Bangladesh, Intel Science Talent Search finalist Thabit Pulak invented an affordable filter to help people remove this toxic pollutant from their drinking water.
- Environment
Does lightning sculpt mountains?
A new study sparks debate about how much rubble on a mountainside has been blasted loose by powerful bolts from the sky.
- Earth
Explainer: Ice sheets and glaciers
Ice sheets and glaciers give scientists clues about climate change.
- Earth
Explainer: Antarctica, land of lakes
There are many, although they tend to be buried under rivers of ice.
- Environment
Explainer: All crude oil is not alike
Crude oil comes in conventional and unconventional types.
- Earth
How Earth’s surface morphs
Partly melted rock acts like grease to help huge masses of the planet’s surface slip up, around and down.
- Climate
Explainer: Why a tornado forms
Tornadoes start with a thunderstorm. But they also require other ingredients, such as instability.
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- Chemistry
Explainer: Ocean acidification
Here’s why shellfish and other animals in the sea suffer when the ocean is forced to absorb too much carbon dioxide.
- Climate
Watching our seas rise
Satellites, coral reefs, ancient Roman fishponds and sinking cities help us understand how humans are changing sea level.
