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At least 91 records · Page 5Linked to original sources
USGS1977

Geologic time: The age of the Earth

The Earth is very old 4 1/2 billion years or more according to recent estimates. This vast span of time, called geologic time by earth scientists and believed by some to reach back to the birth of the Solar System, is difficult if not impossible to comprehend in the familiar time units of months and years, or even centuries. How then do scientists reckon geologic time, and why do they believe the Earth is so old? A great part of the secret of the Earth's age is locked up in its rocks, and man's centuries-old search for the key led to the beginning and nourished the growth of geologic science.

General Information Product↗
USGS1992

Geographic information systems

Geographic information systems (GIS) technology can be used for scientific investigations, resource management, and developmental planning. For example, a GIS might allow emergency planners to easily calculate emergency response times in the event of a natural disaster, or a GIS might be used to find wetlands that need protection form pollution.

General Information Product↗
USGS1994

Using maps in genealogy

In genealogy, maps are most often used as clues to where public or other records about an ancestor are likely to be found. Searching for maps seldom begins until a newcomer to genealogy has mastered basic genealogical routines

General Information Product↗
USGS1995

Glaciers: A water resource

Most Americans have never seen a glacier, and most would say that glaciers are rare features found only in inaccessible, isolated wilderness mountains. Are they really so rare? Or are they really potentially important sources of water supply?

General Information Product↗
USGS1991

The Great Salt Lake

The western part of the conterminous United States is often thought of as being a desert without any large bodies of water. In the desert area of western Utah, however, lies Great Salt Lake, which in 1986 covered approximately 2,300 square miles and contained 30 million acre-feet of water (an acre-foot is the amount of water necessary to cover 1 acre of land with water 1 foot in depth or about 326,000 gallons). To emphasize its size, the Great Salt Lake is the largest lake west of the Mississippi River, larger than the states of Rhode Island and Delaware.

Utah↗
USGS1981

How to order maps on microfilm

The collection comprises over 120,000 maps, including some 15-minute quadrangle maps compiled by the U.S. Army Corps of Engineers, National Parks and Monument maps, River Survey maps, and selected Federal Highway Administration county planning maps. The collection will continue to grow as other types of maps are added.

General Information Product↗
USGS1980

Introduction to the U.S. Geological Survey's EROS Data Center Sioux Falls, South Dakota

The EROS Data Center is a part of the Earth Resources Observation Systems (EROS) Office of the Department of the Interior and is managed by the U.S. Geological Survey. It is the national clearinghouse for the processing and dissemination of spacecraft- and aircraft-acquired images and photographs and electronic data on the Earth's resources. The Center also trains and assists users in the application of such data.

South Dakota↗
USGS1982

Land Use and land cover and associated maps

The Geological Survey is compiling land use and land cover and associated maps for the entire United States. Land use refers to man's activities which are directly related to the land. Land cover describes the vegetation, water, natural surface, and artificial constructions at the land surface. These maps will help satisfy a longstanding need for a consistent level of detail, standardization of categories, and appropriate use of scales of compilation for a type of data frequently used by land use planners, land managers, resource management planners, and others.

General Information Product↗
USGS1984

Maps & minds : mapping through the ages

Throughout time, maps have expressed our understanding of our world. Human affairs have been influenced strongly by the quality of maps available to us at the major turning points in our history. "Maps & Minds" traces the ebb and flow of a few central ideas in the mainstream of mapping. Our expanding knowledge of our cosmic neighborhood stems largely from a small number of simple but grand ideas, vigorously pursued.

General Information Product↗
USGS1994

Maps of the World

Because a map conveys information visually, it is often the best way for presenting facts about the size, shape, and appearance of our world and about the changes that people have imposed on the world. Some world maps show the mountains, rivers, oceans, and plains that make up the face of the Earth. Some show only the boundaries that divide our world into nations. Others show the Earth's resources, population centers, or earthquake activity. Some combine many kinds of information.

General Information Product↗
USGS1999

Maps of the World

Because a map conveys information visually, it is often the best way to present facts about the size, shape, and appearance of our world and about the changes that people have imposed on the world. Some world maps show the mountains, rivers, oceans, and plains that make up the face of the Earth. Some show only the boundaries that divide our world into nations. Others show the Earth's resources, population centers, or areas of earthquake activity.

General Information Product↗
USGS1987

Monitoring active volcanoes

One of the most spectacular, awesomely beautiful, and at times destructive displays of natural energy is an erupting volcano, belching fume and ash thousands of meters into the atmosphere and pouring out red-hot molten lava in fountains and streams. Countless eruptions in the geologic past have produced volcanic rocks that form much of the Earth's present surface. The gradual disintegration and weathering of these rocks have yielded some of the richest farmlands in the world, and these fertile soils play a significant role in sustaining our large and growing population. Were it not for volcanic activity, the Hawaiian Islands with their sugar cane and pineapple fields and magnificent landscapes and seascapes would not exist to support their residents and to charm their visitors. Yet, the actual eruptive processes are catastrophic and can claim life and property.

General Information Product↗
USGS1967

Mountains and plains Denver's geologic setting

A slice of geologic history is exposed to view in the Denver, Colorado area. Denver is situated on the High Plains near the east front of the Rocky Mountains. As one travels westward from Denver toward the mountains, successively older rocks are crossed from the geologically young rocks of the High Plains and the South Platte River valley to the older rocks of the foothills and the ancient rocks of the mountains. Thus, within a few miles,the journey turns back the pages of time in a lifesized textbook that vividly illustrates the geologic events that shaped the landscape.

Colorado↗
USGS1993

National Atlas Maps

The National Atlas of the United States of America was published by the U.S. Geological Survey in 1970. Its 765 maps and charts are on 335 14- by 19-inch pages. Many of the maps span facing pages.

General Information Product↗
USGS1988

NCIC state affiliates

In 1974, the U.S. Geological Survey, Department of the Interior, established the National Cartographic Information Center (NCIC) to serve as the public's primary source for information concerning the availability of cartographic, geographic,and remotely sensed data. As part of its program of providing information to the public, NCIC began in 1976 to develop a network of State affiliated offices to provide local access to this information.

General Information Product↗
USGS1993

Permafrost

In 1577, on his second voyage to the New World in search of the Northwest Passage, Sir Martin Frobisher reported finding ground in the far north that was frozen to depths of "four or five fathoms, even in summer," and that the frozen condition "so combineth the stones together that scarcely instruments with great force can unknit them." This permanently frozen ground, now termed permafrost, underlies perhaps a fifth of the Earth's land surface. It occurs in Antarctica but is most extensive in the Northern Hemisphere. In the lands surrounding the Arctic Ocean, its maximum thickness has been reported in thousands of feet as much as 5,000 feet in Siberia and 2,000 feet in northern Alaska.

General Information Product↗
USGS1992

Planetary maps

An important goal of the USGS planetary mapping program is to systematically map the geology of the Moon, Mars, Venus, and Mercury, and the satellites of the outer planets. These geologic maps are published in the USGS Miscellaneous Investigations (I) Series. Planetary maps on sale at the USGS include shaded-relief maps, topographic maps, geologic maps, and controlled photomosaics. Controlled photomosaics are assembled from two or more photographs or images using a network of points of known latitude and longitude. The images used for most of these planetary maps are electronic images, obtained from orbiting television cameras, various optical-mechanical systems. Photographic film was only used to map Earth's Moon.

General Information Product↗