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Size of this PNG preview of this SVG file: 512 × 322 pixels. Other resolutions: 320 × 201 pixels | 640 × 403 pixels | 1,024 × 644 pixels | 1,280 × 805 pixels | 2,560 × 1,610 pixels. Original file (SVG file, nominally 512 × 322 pixels, file size: 202 KB) Wikimedia Commons Commons is a freely licensed media file repository. .
The ecology of the Sierra Nevada, located in the U.S. states of California and Nevada, is diverse and complex. The combination of climate, topography, moisture, and soils influences the distribution of ecological communities across an elevation gradient from 500 to 14,500 feet (200 to 4,400 m). Biotic zones range from scrub and chaparral ...
The Central Great Plains are a prairie ecoregion of the central United States, part of North American Great Plains. The region runs from west-central Texas through west-central Oklahoma, central Kansas, and south-central Nebraska . It is designated as the Central and Southern Mixed Grasslands ecoregion by the World Wide Fund for Nature .
The bald eagle is the national bird of the United States and appears on its Great Seal.The bald eagle's range includes all of the contiguous United States and Alaska.. The fauna of the United States of America is all the animals living in the Continental United States and its surrounding seas and islands, the Hawaiian Archipelago, Alaska in the Arctic, and several island-territories in the ...
The Eastern Temperate Forests is a Level I ecoregion of North America designated by the Commission for Environmental Cooperation (CEC) in its North American Environmental Atlas. The region covers much of the Eastern and Midwestern United States, the U.S. Interior Highlands, and parts of Ontario, Quebec, and the Maritimes .
The history of agriculture in the United States covers the period from the first English settlers to the present day. In Colonial America, agriculture was the primary livelihood for 90% of the population, and most towns were shipping points for the export of agricultural products. Most farms were geared toward subsistence production for family use.
Shaded relief map of the United States, showing 10 geological provinces The richly textured landscape of the United States is a product of the dueling forces of plate tectonics, weathering and erosion. Over the 4.5 billion-year history of the Earth, tectonic upheavals and colliding plates have raised great mountain ranges while the forces of ...
A state mammal is the official mammal of a U.S. state as designated by a state's legislature. The first column of the table is for those denoted as the state mammal, and the second shows the state marine mammals. Animals with more specific designations are also listed.