|
As
we look at Earth from the vantage point of outer space, we can't but help notice
how important water is to Earth's surface. Three quarters of our planet is covered
with liquid and frozen water. The land surface is shaped by water's movements.
Living things need water for survival. Water exists as vapor in the atmosphere
and is the stuff of clouds. As a renewable resource, water transforms through
three states of matter, solid, liquid, and gas as it cycles from the oceans
to the atmosphere, to the land, and back to the oceans. Water and its effects
are the dominant features Space Shuttle astronauts see from space. Water is
a powerful force of change.
Earthpics Archive 2 :: Please note that images are chronicled from most to least
recent.
|
|
Hurricane
Bonnie, Atlantic Ocean (STS-47-151-618) Among the most destructive
forces of nature, hurricanes and typhoons are driven by the
Sun's heat and act as a great pressure relief valve for Earth's
atmosphere. The view of Hurricane Bonnie was captured by the
Crew of STS-47 as the storm swirled about 800 kilometers away
from Bermuda near 35.4 degrees north latitude and 56.8 degrees
west. At this stage in its life, Hurricane Bonnie has a well
developed eye where air currents are relatively calm. Window
reflections are visible on the right side of the picture.
|
|
|
The
presence and the absence of water are both clearly seen in
this STS-50 view of the Sinai Peninsula from the Nile river
into Iraq. The Fayum Depression, the well watered valley of
the lower Nile, and the fertile Nile Delta are dark in contrast
to the lighter orange and yellow of the surrounding desert.
The boundary between the light desert and darker brush land
marks the Egypt-Israel border. Other color variations are
caused by differences in bedrock composition and weathering.
|
|
|
Although
much slower as an agent of change than is running water, mountain
glaciers dramatically alter the land as the ice in them slowly
flows to lower elevations. Wrenching rock and soil from valley
floors and walls, glaciers sculpt the land as they deposit
sediment at their lower end. In this STS-48 picture, some
of the most dramatic landscape in the Americas is seen. The
Andes mountain range near Patagonia, Argentina is partly covered
by a permanent ice cap that is part of the Los Glacieres National
Park. One glacier is seen cutting off an arm of Lake Argentina
(top). Water backs up behind the glacier and eventually gives
way in spring in a thunderous burst that can be heard as far
as 40 kilometers away.
|
![[Amazon River]](/gsfc/images/earth/amazon_small.gif) |
Though
slow moving at its mouth, the Amazon River has deposited millions
of cubic meters of sediment into the Atlantic Ocean. Up river,
heavy tropical rains cover the Amazon Basin and wash away
thin tropical topsoil to the sea. Converting rain forest to
agricultural land aggravates the erosion. The sediment plume
from the river extends past the delta, built up of deposited
sediment, and bends to the north to hug the coast. The plume
is driven northward by the west by northwest Guyana Current.
The large island of Marajo is partly visible through the widespread
scattered cloud cover. The structure to the side of the picture
is the remote manipulator system arm of the Shuttle orbiter.
|
|
|
This
is a thematic mapper color composite image of Amazonas, Brazil,
acquired using the Landsat-4 and 5 satellites on August 15,
1988. The Rio Negro River (predominant dark color river from
upper left) can be seen joining with the Rio Solimoes River
(blue color river from bottom left to center right) to form
the Amazon River at Manaus, seen to the far right of the image.
Areas of tropical forest appear as dark orange colors; areas
of deforestation appear as blue to blue/green colors, and
areas of regrowth appear as lighter orange colors. Note how
deforestation usually is associated with the transportation
network of rivers and roads. The area covered in the image
measures approximately 108 by 114 miles (175 by 185 kilometers).
|
|
|
These
are Landsat MSS images of Mount St. Helens from September
15, 1973, May 22, 1983 and August 31, 1988.
|
|
|
This
is a thematic mapper color compostite image of Washington,
DC using the Landsat 4 satellite.
|
|