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This map, created using data from the Gravity Recovery and Climate Experiment (GRACE) mission, reveals variations in the Earth's gravity field. Dark blue areas show areas with lower than normal gravity, such as the Indian Ocean (far right of image) and the Congo river basin in Africa. Dark red areas indicate areas with higher than normal gravity.
If the Earth were a perfectly round sphere, any point on the planet’s surface would have the same average gravity field. However, mountains, deep oceanic trenches, and other features cause minute changes in Earth’s gravity. Just as these mountains and deep trenches change the Earth’s gravity field, so do changes in the amount of groundwater.
If the Earth were a perfectly round sphere, any point on the planet’s surface would have the same average gravity field. However, mountains, deep oceanic trenches, and other features cause minute changes in Earth’s gravity. Just as these mountains and deep trenches change the Earth’s gravity field, so do changes in the amount ofgroundwater.
Pertaining to the measurement, and effects of variations in the Earth's rotation about its axis, and variations in the Earth's orbit around the sun. Definition source: National Aeronautics and Space Administration
SRTM collected topographic data over nearly 80% of Earth's land surfaces, creating the first-ever near-global dataset of land elevations. The SRTM payload consisted of two radar antennas, one located in the shuttle's payload bay and the other installed on the end of a 200-foot mast that extended from the payload bay.
Explore Learning Resources. NASA’s massive archive of Earth science data are free and open to any user for any purpose—but accessing, analyzing, visualizing, and applying these data requires a certain degree of knowledge about Earth observation data and how it is collected and optimized.
Geodesy is the science of the Earth’s shape, gravity, and rotation, including their evolution in time. Several techniques are used to observe the geodetic properties of the Earth, including Global Navigation Satellite Systems (), Satellite Laser Ranging (), Very Long Baseline Interferometry (), and the Doppler Orbitography and Radio-Positioning by Integrated Satellite
The ice flows like a conveyor belt driven by gravity and ever mounting snows. Ablation Zone: Where the glacier loses ice through melting, calving, and evaporation Output Zone: In this zone, the glacier loses ice. This is the lower region of the glacier. Meltwater flows out to the terminus through hidden channels and tunnels. Oldest ice is the ...
Earth's atmosphere is a layer of mixed gases approximately 60 miles high that provides the air we breathe, shields us from dangerous levels of ultraviolet light from the sun, and traps enough heat to maintain a livable environment.
In the background, the Gravity Recovery and Climate Experiment (GRACE) satellites pass over Earth; their data have revealed the detail in Earth’s gravitational field, shown as color relief on the surface. Warmer colors indicate stronger gravity, and cooler colors indicate weaker gravity.