Videos

Ammonia or ammonium? What’s the difference? In water, ammonia (NH₃) and ammonium (NH₄⁺) exist together in an equilibrium that depends on pH and temperature. As the temperature or pH rise, ammonia (NH₃) becomes more abundant. This is important because ammonia is more toxic than ammonium.

This animated nitrogen fixation video provides an overview of natural and industrial nitrogen fixation, along with benefits, costs, trends, and effects on ecosystems.

This animated nitrogen fixation video provides an overview of natural and industrial nitrogen fixation, along with benefits, costs, trends, and effects on ecosystems.

This animation of the biogeochemical nitrogen cycle illustrates the main steps of the cycle in air, water, and soils. The video explains and connects the many forms of nitrogen, such as ammonia, ammonium, hydroxylamine, nitrite, nitrate, nitrous oxide, and nitrogen dioxide, and explains the role of nitrate in nitric oxide signaling in the human body.

This animation of the biogeochemical nitrogen cycle illustrates the main steps of the cycle in air, water, and soils. The video explains and connects the many forms of nitrogen, such as ammonia, ammonium, hydroxylamine, nitrite, nitrate, nitrous oxide, and nitrogen dioxide, and explains the role of nitrate in nitric oxide signaling in the human body.

The island of Puerto Rico is subject to numerous natural hazards including hurricanes and coastal erosion. Information on how the island’s coastal environments respond to these events is critical for bolstering coastal resilience. Dr.

La isla de Puerto Rico está sujeta a numerosos peligros naturales, incluyendo huracanes y erosión costera. La información sobre cómo responden los entornos costeros de la isla a estos eventos es fundamental para reforzar la resiliencia costera. La Dra.

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The increasing risk of flooding along our coasts is driven by climate change, development and habitat loss.

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• En español.

Take a virtual tour of the USGS St. Petersburg Coastal and Marine Science Center to learn about the science we do and how we do it!

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Take a virtual tour of the USGS St. Petersburg Coastal and Marine Science Center to learn about the science we do and how we do it!

Listen to the audio-described version.

The smell of a fresh cut Christmas tree can evoke visions of majestic evergreen forests teeming with winter wildlife. In truth, more than half of U.S. Christmas trees come from farms in Oregon, North Carolina, or Michigan. Cut Christmas Trees area commodity, tracked by the U.S. Department of Agriculture just like corn or soybeans.

The U.S. Fish and Wildlife Service’s (FWS) Everglades Headwaters National Wildlife Refuge (EHNWR) is strategically located in Florida to protect upland and wetland habitats.

The Earth As Art project began in the early 2000s, and its original intent remains the same: to produce images that do not look like satellite images at first glance.

Hurricane Michael made landfall in the Florida Panhandle on October 10, 2018.



Landsat 7 images captured before and after highlight the destructive path of the Category 4 storm.

Hurricane Florence hit the Carolina coast on September 14, 2018, but it took much longer for the full impact to emerge.

Remotely-sensed images show the slow devastation that 13 trillion gallons of rain can bring as it moves back toward the sea.

An important conservation strategy for climate change is to enhance and maintain regional habitat connectivity for the long-term viability of wildlife populations. Modeling habitat connectivity for wildlife species often results in a mapped network of linkages between habitat patches.

A USGS video about manatees reveals that while the animals may act like the cows of the sea, they also have more than a bit of the magical siren or mermaid about them.  Go for a serene swim.

Before a hurricane, USGS Scientists undertake a data collection effort of a grand scale. They install a temporary mobile network of sensors along the coasts to collect additional data on the intensity of storm surge, one of the most dangerous elements of a hurricane.

Landsat 8 imagery shows the change in vegetation on Puerto Rico after Hurricane Maria.



At the USGS EROS Center, we study land change, operate the Landsat satellites, and maintain the longest, continuously acquired collection of images of the Earth's land surface.

Hurricane Irma churned up sediment around the Florida keys as shown by these Landsat images.



At the USGS EROS Center, we study land change, operate the Landsat satellites, and maintain the longest, continuously acquired collection of images of the Earth's land surface.