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Image: Muir and Riggs Glaciers, Muir Inlet, Alaska - 2004
Muir and Riggs Glaciers, Muir Inlet, Alaska - 2004
Muir and Riggs Glaciers, Muir Inlet, Alaska - 2004
Muir and Riggs Glaciers, Muir Inlet, Alaska - 2004

The second repeat photograph documents significant changes that have occurred during the 63 years between photographs A and C, and during the 54 years between photographs B and C. Muir Glacier has retreated out of the field of view and is now more than 7 kilometers northwest. Riggs Glacier has retreated as much as 600 meters and thinned more than 250 meters.

The second repeat photograph documents significant changes that have occurred during the 63 years between photographs A and C, and during the 54 years between photographs B and C. Muir Glacier has retreated out of the field of view and is now more than 7 kilometers northwest. Riggs Glacier has retreated as much as 600 meters and thinned more than 250 meters.

Image: Saddleback Caterpillar (Acharia stimulea)
Saddleback Caterpillar (Acharia stimulea)
Saddleback Caterpillar (Acharia stimulea)
Saddleback Caterpillar (Acharia stimulea)

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

Image: Saddleback Caterpillar (Acharia stimulea)
Saddleback Caterpillar (Acharia stimulea)
Saddleback Caterpillar (Acharia stimulea)
Saddleback Caterpillar (Acharia stimulea)

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

Image: Saddleback Caterpillar (Acharia stimulea)
Saddleback Caterpillar (Acharia stimulea)
Saddleback Caterpillar (Acharia stimulea)
Saddleback Caterpillar (Acharia stimulea)

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on its back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on its back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

Image: Saddleback Caterpillar (Acharia stimulea)
Saddleback Caterpillar (Acharia stimulea)
Saddleback Caterpillar (Acharia stimulea)
Saddleback Caterpillar (Acharia stimulea)

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

Image: Asparagus Cropland
Asparagus Cropland
Asparagus Cropland
Asparagus Cropland

An asparagus cropland and golden hillsides taken in in the Central California Valley Ecoregion (CA) in September 2004.

An asparagus cropland and golden hillsides taken in in the Central California Valley Ecoregion (CA) in September 2004.

Image shows a man with scientific equipment standing in a green farm field
Bernard Hubbard Ground-Truthing Remote Sensing
Bernard Hubbard Ground-Truthing Remote Sensing
Bernard Hubbard Ground-Truthing Remote Sensing

USGS scientist Bernard Hubbard conducting spectral measurements of soils and cover crops to ground truth satellite imagery being used to map soil erosion and runoff potential into the Chesapeake Bay watershed.

USGS scientist Bernard Hubbard conducting spectral measurements of soils and cover crops to ground truth satellite imagery being used to map soil erosion and runoff potential into the Chesapeake Bay watershed.

Image: Leafcutter Bee at Indiana Dunes National Lakeshore
Leafcutter Bee at Indiana Dunes National Lakeshore
Leafcutter Bee at Indiana Dunes National Lakeshore
Leafcutter Bee at Indiana Dunes National Lakeshore

This native leafcutter bee, Trachusa zebratum, is a solitary bee species associated with sandy soils where the female builds her own nest to lay her eggs in.

This native leafcutter bee, Trachusa zebratum, is a solitary bee species associated with sandy soils where the female builds her own nest to lay her eggs in.

Image: Waterfall
Waterfall
Waterfall
Waterfall

Small waterfall at base of hill lined with trees and foliage alongside stream.

Small waterfall at base of hill lined with trees and foliage alongside stream.

Image: River Reflecting Conifers and Mountains
River Reflecting Conifers and Mountains
River Reflecting Conifers and Mountains
Image: Khao Sok National Park
Khao Sok National Park
Khao Sok National Park
Khao Sok National Park

Scenic view taken from a boat of mountains and coast in Khao Sok National Park.

Scenic view taken from a boat of mountains and coast in Khao Sok National Park.

Image: Cliffs Encircling Lentic Water
Cliffs Encircling Lentic Water
Cliffs Encircling Lentic Water
Cliffs Encircling Lentic Water

Sheer cliffs covered in vegetation encircling a lentic body of water.

Image: Snake River
Snake River
Snake River
Snake River

Vegetation along bank of Snake River with view of treeline and hovering clouds.

Vegetation along bank of Snake River with view of treeline and hovering clouds.

Image: Mountains and Snake River
Mountains and Snake River
Mountains and Snake River
Mountains and Snake River

Trees cast in shadow lie in the foreground as mountains rise in the back. The Snake River flows at the bottom of step-like slopes.

Trees cast in shadow lie in the foreground as mountains rise in the back. The Snake River flows at the bottom of step-like slopes.

Image: Snake River
Snake River
Snake River
Snake River

View of Snake River with mountains in background and clouds overhead.

View of Snake River with mountains in background and clouds overhead.

Image: Cavity Opening to the Shore
Cavity Opening to the Shore
Cavity Opening to the Shore
Cavity Opening to the Shore

Sloping landform with a cavity that opens out to the shore. Vegetation thickly covers a sloping face. Other landforms can be seen behind, also covered in vegetation.

Sloping landform with a cavity that opens out to the shore. Vegetation thickly covers a sloping face. Other landforms can be seen behind, also covered in vegetation.

Image: Mountains, Forest and Plains
Mountains, Forest and Plains
Mountains, Forest and Plains
Mountains, Forest and Plains

This photograph highlights the grandeur of the mountains and plains. The group of trees in the left foreground is part of a larger forest.

This photograph highlights the grandeur of the mountains and plains. The group of trees in the left foreground is part of a larger forest.

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