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Africa's Sahara Desert is expanding, encroaching on savanna ecosystems.
Satellite image showing the Sahara Desert (beige) and savannas to the south (green).
A seemingly endless sea of sand, the Sahara stretches to the horizon.
South of the Sahara is the Sahel transition zone between desert and savanna.
An intense Saharan dust storm sends a massive dust plume northwestward over the Atlantic Ocean.
The McMurdo Dry Valleys with a view of Lake Hoare and the Canada Glacier.
One of the study yards, dotted with bee-attracting flowers.
Geography and Spatial Sciences supports research on interactions of humans and their environments.
How much has the Mississippi Delta changed over time, and what might it look like in the future?
Scientists Zhixiong Shen and Elizabeth Chamberlain collect a riverbank sample for dating.