The most valuable fossils found in sediment cores are from tiny animals with a calcium carbonate shell, called foraminifera. One species of foraminifera lives in the icy waters of the Arctic above ...

Less than two years after dissecting the head of the great white shark, Steno completed a manuscript on the geology of Tuscany. The locale was a shrewd choice; it celebrated the homeland of his ...

Examine the set of graphs below for a given city. Read carefully the temperature and precipitation scales on the graphs. Review the biome information. Two biome choices are given for each set of ...

Phytoplankton are the foundation of the aquatic food web, the primary producers, feeding everything from microscopic, animal-like zooplankton to multi-ton whales. Small fish and invertebrates also ...

All of this extra carbon needs to go somewhere. So far, land plants and the ocean have taken up about 55 percent of the extra carbon people have put into the atmosphere while about 45 percent has ...

Between 1950 and 2003, the world’s population grew from an estimated 2.5 billion to 6.3 billion, according to the U.S. Census Bureau. More people are affected by natural disasters today because there ...

× This page contains archived content and is no longer being updated. At the time of publication, it represented the best available science. Before widespread human settlement began to encroach on the ...

Among the first things the data revealed was a definite seasonal difference in cloudiness over the polar regions. Cloud fraction (the fraction of the area in a map’s grid box covered by cloud) over ...

Kathryn Hansen is the managing editor for NASA Earth Observatory. She has been writing stories, producing videos, and editing content for the group since 2014. Prior to joining Earth Observatory, ...

Have you ever wondered what it would be like to live in a different part of the world? What would the weather be like? What kinds of animals would you see? Which plants live there? By investigating ...

Michael Carlowicz was managing editor of NASA’s Earth Observatory from 2010 to 2022. He has written about Earth science and geophysics since 1991 for several NASA divisions, the Woods Hole ...

On the floor of the aquarium, spread a 1-inch layer of gravel. Mix the soil in the following ratios: Design an observation chart. Chart any changes in your plants. Give water in increments of a 1/2 ...