Beth Geiger | Science News for Students

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Beth Geiger

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a photo of a salmon jumping out of water

A salmon’s sense of smell is critical for its survival. But rising acidity in the world’s oceans could hamper the fish’s ability to detect danger, a new study finds.

John Pennell/iStockphoto

 Ecology
Is ocean acidification knocking the scents out of salmon?
In more acidic water, the smell of danger doesn’t trigger salmon’s fear factor like it should
a photo of a stream flowing through some woods taken from just above water level

Freshwater makes up just a tiny percent of the water on Earth. Yet we depend on it for everything from growing food to manufacturing to everyday uses at home. The averge American uses 340 liters (90 gallons) per day.

Valery Bocman/iStockphoto

 Weather & Climate
A wave of change is coming to our planet’s water resources
Thanks to climate change, Earth’s freshwater supplies will never be the same again
a photo of heavy rain falling on a colorful umbrella outside

Rain is just one part of the planet’s water cycle.

RomoloTavani/iStockphoto

 Weather & Climate
Explainer: Earth’s water is all connected in one vast cycle
Water is constantly on the move in an endless loop known as the water cycle
ANSMET meteorite collection
Each year, groups of scientists with the Antarctic Search for Meteorites (ANSMET) project spend weeks camping on ice fields in Antarctica. Using snowmobiles, they travel about looking to find and bring back meteorites. Here's a group that has just met with success.

NASA

 Earth
Hot on the trail of Antarctic meteorites
Each year, scientists scour the frozen continent for space rocks
Mount Erebus
Mount Erebus, the world’s southernmost active volcano, rises 3,794 meters (12,477 feet) above the ice in Antarctica. It’s in the same region as the newly discovered buried volcanoes.
Steve Rupp/National Science Foundation
 Earth
Giant volcanoes lurk beneath Antarctic ice
The expanse of buried volcanoes raises questions about the future of the ice sheet
Arctic water

The Arctic Ocean didn’t become salty until a stretch of land that ran from Greenland (pictured here) to Scotland sank far enough beneath the sea, a new study finds.

SteveAllenPhoto/iStockphoto

 Oceans
How the Arctic Ocean became salty
A land bridge had to sink far enough below a top-of-the-world lake to let Atlantic saltwater overwhelm it