Arizona

Utah

Idaho

Wyoming

Montana

Texas

Missouri

Oregon

New Mexico

Nevada

California

None

A world map shows nitrate mining locations marked by orange circles with "N." Key areas include the U S, Mexico, Chile, and Spain. Major clusters are in the U S (western states), Mexico, and northern Chile's Atacama Desert.

Nitrate Mines

World

USGS

Alaska

Yukon

Northwest Territories

District of Columbia

Florida

New Hampshire

Rhode Island

Vermont

Washington

Nunavut

Maine

North Dakota

Kentucky

Nova Scotia

Virginia

Delaware

Prince Edward Island

Saskatchewan

Mississippi

West Virginia

Nebraska

Louisiana

North Carolina

New Brunswick

Alabama

Kansas

Wisconsin

British Columbia

Newfoundland and Labrador

New Jersey

South Carolina

Michigan

Alberta

Connecticut

Pennsylvania

Colorado

Massachusetts

Georgia

New York

Maryland

Québec

Manitoba

Oklahoma

Tennessee

Ontario

Arkansas

South Dakota

Ohio

Indiana

Minnesota

Iowa

Illinois

A map of North America shows various ecological regions, each marked with a distinct color to represent different Level 1 ecological regions.

Extent of the Level I Ecological Regions of North America

Ecological Regions: Level 1 Regions

Arctic Cordillera (Red): Found in the northernmost parts of Canada, specifically the Arctic Archipelago. Tundra (Blue): Covers large portions of northern Canada, including parts of Nunavut and the Northwest Territories, as well as coastal areas of Alaska. Taiga (Purple): Spans across central and northern Canada, covering parts of Quebec, Ontario, Manitoba, Saskatchewan, Alberta, and British Columbia. Hudson Plain (Orange): Located in the northeastern part of Canada, around the Hudson Bay area. Boreal Forests (Yellow): Encompasses large areas in Canada, south of the tundra and taiga regions, and extends into parts of Newfoundland and Labrador. Northwestern Forested Mountains (Green): Found along the western coast of Canada and the United States, covering parts of British Columbia and Alaska. Marine West Coast Forest (Brown): Occupies the coastal regions of the Pacific Northwest, including areas in British Columbia, Washington, Oregon, and northern California. Eastern Temperate Forests (Pink): Stretch from the Great Lakes region through the northeastern United States and into eastern Canada. Great Plains (Grey): Span the central United States from Canada to Texas, including parts of Alberta, Saskatchewan, Manitoba, and several central U.S. states. Deserts and Steppes (Dark Green): Found in the southwestern United States and northern Mexico, covering areas in Arizona, New Mexico, and parts of California and Nevada. Mediterranean California (Dark Pink): Specific to the coastal regions of central and southern California. Southern Semi-Arid Highlands (Gold): Located in central Mexico and parts of the southwestern United States. Temperate Sierras (Dark Brown): Found in Mexico, primarily in the Sierra Madre ranges. Tropical Dry Forests (Light Brown): Present in parts of southern Mexico and Central America. Tropical Wet Forests (Light Tan): Located in the southeastern part of Mexico and Central America, including the Yucatan Peninsula.

North America

Hawaii

A map shows areas of insolation (incoming solar radiation) across the world, categorized by watts per square meter.

Average annual levels of solar radiation reaching the Earth's surface

Insolation

The map illustrates global insolation, showing variations in incoming solar radiation from the tropics to the polar regions. In the Northern Hemisphere, high insolation (220 to 280 plus watts per square meter), highlighted as dark green to dark red spans from northwestern Mexico through southern Texas, Florida, and the Caribbean, across the Atlantic to North Africa and Southwest Asia, with peaks in the eastern Sahara and Arabian Peninsula. In the Southern Hemisphere, high insolation areas stretch from East Africa to South Africa and across the Indian Ocean to most of Australia, with other high insolation zones in the Central Pacific and south-central South America. Middle insolation values (120 to 219 watts per square meter), highlighted as light blue to green, are found between 50 degrees north and 50 degrees south latitude, excluding high insolation regions. Low insolation areas (80 to 119 watts per square meter), highlighted as blue to light blue, are located north of the 50-degree lines to the poles in North America, the North Atlantic, and Eurasia, and around the Southern Ocean in Antarctica. The lowest insolation values (less than 80 watts per square meter), highlighted as dark blue, are in the ocean east of northern Greenland.

Display by:	Nitrate Mines	Ecological Regions: Level 1 Regions														Insolation
	Nitrate Mines	Arctic Cordillera	Tundra	Taiga	Hudson Plain	Boreal forests	Northwestern forested mountains	Marine west coast forest	Eastern temperate forests	Great Plains	Deserts and steppes	Mediterranean California	Southern semi-arid highlands	Temperate sierras	Tropical wet forests	240–259	220–239	200–219	180–199	160–179	140–159	120–139	100–119	80–99	Less than 80
Alaska			25.1%	6.23%			14.3%	3.61%															28.4%	69.2%	2.23%
Arizona	2										66.3%		12.9%	19.7%		44.2%	33.7%	22.1%
Utah	4						19.3%				80.3%							70.0%	8.89%	2.63%
Yukon			7.08%	38.7%			53.4%																100%
Northwest Territories			3.04%	63.7%																		2.63%	82.4%	14.9%
District of Columbia									100%											100%
Florida									84.3%						14.5%		32.7%	67.3%
Idaho	2						57.3%				40.7%									78.1%	21.9%
New Hampshire						82.5%			17.5%												100%
Rhode Island									92.1%												100%
Vermont						86.9%			13.1%												100%
Washington							44.1%	18.2%			34.8%									1.22%	98.8%
Wyoming	1						6.11%			27.1%	46.4%								12.4%	87.6%
Nunavut		1.96%	1.52%	3.41%																		1.36%	33.1%	65.5%
Montana	2						31.6%			66.0%										14.7%	85.3%
Maine						44.1%			52.2%												99.8%	0.153%
North Dakota										100%											100%
Kentucky									100%										46.4%	53.6%
Nova Scotia						17.5%			6.61%												52.4%	47.6%
Virginia									99.4%										2.49%	97.5%
Delaware									98.4%											100%
Prince Edward Island									89.2%													100%
Saskatchewan				8.06%		57.8%				33.4%											42.7%	57.2%
Mississippi									99.9%									82.1%	17.9%
West Virginia									100%											99.2%	0.827%
Nebraska										100%									9.53%	90.5%
Texas	6								17.3%	4.05%	13.1%					5.26%	58.9%	35.9%
Missouri	1								60.6%	39.4%									66.4%	33.6%
Louisiana									86.4%	12.6%							26.8%	73.2%
Hawaii																	2.67%	97.3%
North Carolina									99.2%										73.0%	27.0%
Oregon	3						53.3%	14.9%			7.11%									96.3%	3.75%
New Brunswick						3.19%			95.8%												47.2%	52.8%
Alabama									99.9%									66.2%	33.8%
New Mexico	1						8.59%			32.9%	7.36%		1.32%	3.54%		15.5%	33.9%	49.1%
Kansas										99.9%								5.90%	91.6%	2.46%
Wisconsin						31.7%			66.5%	1.10%											100%
British Columbia				7.72%		4.25%	60.9%	6.59%			4.95%										21.7%	31.5%	46.8%
Newfoundland and Labrador			5.23%	56.9%		22.4%																29.5%	69.1%	1.36%
New Jersey						11.2%			86.6%											51.6%	48.4%
South Carolina									99.7%										100%
Michigan						25.2%			1.08%												100%
Alberta				17.4%		54.4%	6.61%			21.1%											29.7%	53.1%	17.2%
Connecticut						15.9%			84.0%												100%
Pennsylvania						3.06%			79.4%											19.4%	80.6%
Colorado							38.2%			42.1%	2.98%							48.1%	51.6%	0.332%
Nevada	1										99.6%						1.58%	63.4%	31.2%	3.86%
Massachusetts						32.4%			63.3%										0.220%		99.8%
Georgia									99.9%									48.3%	51.7%
New York						19.7%			1.05%												100%
Maryland									97.9%											100%
Québec			1.01%	37.0%	2.25%	3.73%			1.51%												10.4%	38.5%	41.0%	10.1%
Manitoba				22.1%	11.3%	55.4%				10.0%											26.0%	66.7%	7.35%
Oklahoma									21.6%	78.4%								82.2%	17.8%
Tennessee									100%										100%
Ontario					28.1%	64.1%			7.08%												30.4%	56.0%	13.7%
California	3						26.9%	2.89%			29.8%	39.7%				2.69%	22.7%	49.4%	19.9%	5.25%
Arkansas									100%									50.1%	49.9%
South Dakota							3.94%			96.1%										50.1%	49.9%
Ohio									99.9%											51.6%	48.4%
Indiana									100%										0.561%	79.2%	20.2%
Minnesota						40.6%			24.1%	35.2%											99.9%
Iowa									6.36%	93.6%										77.7%	22.3%
Illinois									99.9%										11.8%	73.8%	14.4%