valley

The floods surged over the valley.

And their research took them to a particular river valley in southern Mexico.

Only a city within easy reach of both the Nile valley to the south and the more spread out, difficult terrain to the north could provide the necessary political control that the rulers of early dynastic Egypt (roughly 3000-2600 B.C.) required.

The valley may have narrowed at this point to a mere three kilometers, making it the ideal place for controlling river traffic.

The foundation of the national capital at the junction of an important trade route with the Nile valley is not likely to have been accidental.

Their appearance and subsequent flourishing in Utah's Great Salt Lake valley within the last 40 years appears to be from such an introduction.

Over a period of decades, dark-colored forms became an increasingly large fraction of some populations and eventually came to dominate peppered moth populations in certain areas —especially those of extreme industrialization such as the Ruhr Valley of Germany and the Midlands of England.

However, good land may itself be limited—for example, within the confines of a river valley where neighbors are in the same position, having filled up the whole of the desirable habitat available in their home territories, expansion is also problematic.

A group of archaeologists returned to a site that had been previously examined, Kuk Swamp, which is in a mountain valley in the highlands of what is now Papua, New Guinea.

All these could be obtained from the nearby highlands, from the Valley of Mexico, and from other regions, if the necessary trading networks came into being.

The spread of this river valley agriculture in various parts of Asia and Africa was the decisive factor in the rise of the first civilizations.

In other instances, such as the Indus River Valley, the cities lacked a royal precinct and the ostentatious palaces that marked their contemporaries elsewhere.

It’s in the Eastern United States, in the Tennessee River Valley.

Efforts to reclaim the land and restore the basin to the fertile valley it once was…well, actually, those efforts are still ongoing.

And there is a Clovis site in a valley in southern California where the remains of thirteen mammoths were found.

For example, states have developed in places like the mild lowlands of Mesoamerica and in Egypt’s Nile River Valley.

Thanks to extremely fine-grained excavation and extensive use of flotation methods (through which seeds are recovered from soil samples), we know a great deal about the foraging practices of the inhabitants of Abu Hureyra in Syria's Euphrates valley.

Some local areas, like the Jordan River valley, the middle Euphrates valley, and some Zagros valleys, were more densely populated than elsewhere.

In flat plains country, he saw moraines (accumulations of earth and loose rock that form at the edges of glaciers) that reminded him of the terminal moraines found at the end of valley glaciers in the Alps.

The first season was the flooding, or inundation, when the Nile valley was essentially submerged in water for a few months or so.

And finally the time of the year would arrive when the valley would produce crops, such as wheat, barley, fruit, all ready to harvest.

How did this tremendous development take place, and why did it happen in the Teotihuacán Valley?

Among the main factors are Teotihuacán’s geographic location on a natural trade route to the south and east of the Valley of Mexico, the obsidian resources in the Teotihuacán Valley itself, and the valley’s potential for extensive irrigation.

The exact role of other factors is much more difficult to pinpoint―for instance, Teotihuacán’s religious significance as a shrine, the historical situation in and around the Valley of Mexico toward the end of the first millennium B.C., the ingenuity and foresightedness of Teotihuacán’s elite, and, finally, the impact of natural disasters, such as the volcanic eruptions of the late first millennium B.C.

Prior to 200 B.C., a number of relatively small centers coexisted in and near the Valley of Mexico.

The valley, like many other places in Mexican and Guatemalan highlands, was rich in obsidian.

At about the same time that the Sahara was becoming a desert…hmm ...5,000 years ago, Egypt really began to flourish out in the Nile River valley.

So it’s only logical to hypothesize that a lot of these people migrated to the Nile valley when they realized that this was more than a temporary drought.

Death valley is this desert plain, a dry lake bed in California surrounded by mountains and on the desert floor these huge rocks, some of them hundreds of pounds.

The same thing happens to this day, though on a smaller scale, wherever a sediment-laden river or stream emerges from a mountain valley onto relatively flat land, dropping its load as the current slows: the water usually spreads out fanwise, depositing the sediment in the form of a smooth, fan-shaped slope.

As a result, Earth's surface has been continually changed and eroded into delicate systems of river valleys - a remarkable contrast to the surfaces of other planetary bodies where impact craters dominate.

As a result, river valleys are the dominant feature of its landscape.

Broad, windswept valleys; glaciated mountains; sparse vegetation; and less moisture created a rather forbidding land mass.

Extensive mountain ranges were formed from compression of the crust, forming long ridges with parallel valleys spaced one to two kilometers apart.

OK. I guess what I am really confused about is how the topography of the land, the mountains and valleys and stuff, affects precipitation.

In other areas, you've got canyons, ripped valleys, meteor craters, uh, lava domes, these lava formations that look like giant pancakes.

However, in many places (for example, California, Hawaii, the Philippines, Japan, Mexico, the rift valleys of Africa)the resource is potentially so large that its future will depend on the economics of production.