Earth
- Earth
Evolution of river systems
A river’s erosion downward and across a landscape is based on a variety of factors, including terrain steepness and the arrangement of tributaries.
- Paleontology
Microbes indicted in ancient mass extinction
About 252 million years ago an estimated 96 percent of all species were wiped from Earth, and now scientists have a new suspect in the killing — methane-belching microbes.
- Animals
As their homes warm, salamanders shrink
Many species of salamanders respond to climate change by getting smaller.
- Environment
Artists’ sunsets may reveal past pollution
The colors artists used in the sunsets of their paintings may provide clues to what was circulating in the air hundreds of years ago.
- Climate
Natural climate shifts affect sea level rise
A recent dip in the rate of sea level rise may be due to natural climate variability.
- Climate
Kangaroo gut microbes make eco-friendly farts
Understanding kangaroos’ low-methane flatulence could help researchers lower greenhouse gas emissions from livestock.
- Planetary Science
How Earth’s radiation belt gets its ‘stripes’
The rotation of the Earth may give the planet's inner radiation belt its zebralike stripes.
- Climate
Climate change may spread Lyme disease
The territory of the ticks that transmit Lyme disease is growing as the climate warms.
- Earth
How the Chicxulub impact made acid rain
Using lasers to accelerate materials to asteroid-like impact velocities, scientists have shown how the Chicxulub asteroid impact, which happened roughly 65 million years ago, could have created a mass extinction in the oceans.
- Climate
Warm, wet weather may have helped Genghis Khan rule
Mild, wet weather — not drought — may have helped Genghis Khan expand the Mongolian empire to the largest in human history.
- Physics
Shifting grains may explain earthquake lightning
Mysterious lightning before or during earthquakes could get its spark from underground shifting.
- Animals
Spotted seals hear well in and out of water
Spotted seals, native to the northern parts of the Pacific, hear frequencies that may mean they are susceptible to the effects of anthropogenic noise.
