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Near Presidio Trail at Big Bend Park: This photograph was taken beside the highway at the top of a hill near the Presidio Trail. It shows the Rio Grande River Valley below, and mountains in the background.; Format: image/photograph

The Rio Grande River at Santa Elena Canyon: This photograph was taken from the bank of the Rio Grande River at Santa Elena Canyon. The river is very narrow and low. Black soil and rocks line the banks and a trail of rocks cross the river like stepping stones.; Format: image/photograph

Rio Grande River at Santa Elena Canyon: The Rio Grande River banks lie in the shadows of the cliffs in Santa Elena Canyon at Big Bend National Park. The sheer cliffs are on the right side of the photograph. On the left in the distance, bathed in the sunlight are mountain peaks.; Format: image/photograph

Flowering cactus in Big Bend National Park: This closeup of a cactus shows off its bright yellow flowers. Several flower buds are yet to bloom.; Format: image/photograph

Tuff Canyon near the Castelon area of Big Bend National Park: This photograph shows the Tuff Canyon Cliff near the Castalon area. Tuff is “a rock composed of consolidated or cemented volcanic ash.” These gray cliffs show a great deal of erosion from Blue Creek as it cut through the rock. Strewn at the base...; Format: image/article

Egrets atop a tree at the Maverick entrance to Big Bend National Park: One of the western entrances to Big Bend National Park is near Maverick Mountain. Seven white egrets with orange beaks sit atop a tree nearby.They standout against the bright blue sky.; Format: image/photograph

Yucca plant: A large Yucca plant is in full flower in this picture taken in Big Bend National Park. Behind and to the left of the plant is a stone wall with a bed of flowers at its base. To the right of the plant is a barbed wire fence; a dirt road runs along behind it....; Format: image/photograph

Flowering plant in the Chisos Basin Area of Big Bend National Park: Small red flowers bloom in clusters on the tips of tall stalks in Big Bend National Park's Chisos Basin area. In the background is a rugged mountain.; Format: image/photograph

Window Trail Chisos Basin Area of Big Bend National Park: Rocks along the Window Trail in the Chisos Basin area of Big Bend National Park were made from volcanic activity over 32 million years ago. These rocks have a turquoise bluish tint to them. Their folds create a stair-step effect.; Format: image/photograph

Windows Trail in the Chisos Basin area of Big Bend National Park: These rugged peaks show the striations and various colors of rock which were made during volcanic eruptions over 32 million years ago. Trees and other forms of vegetation cling to the crevices of the rock which can be seen on the Window Trail in the Chisos...; Format: image/article

Lost Mine Trail of the Chisos Basin: The photographer has taken a spectacular picture of the Chisos Mountains from the Lost Mine Trail. The Chisos were made over 32 million years ago from volcanic activity.; Format: image/photograph

Boquillas Canyon: The Rio Grande River can be seen snaking through the Boquillas Canyon in thi photograph. Steep canyon cliffs tower above the river. The Boquillas Canyon area is on the eastern side of the park near the Rio Grande Village.; Format: image/photograph

Natural Springs Trail and the Rio Grande River: This portion of the Natural Springs Trail winds along the banks of the Rio Grande River at Big Bends National Park in Texas. Scrubby vegetation lines the banks and mountains can be seen in the distance.; Format: image/photograph

Wild burros on the road near Presidio Trail: Near the Presidio Trail in the Big Bend National Park, wild burros can be seen walking along a road. In the background is a mountainous area with lush green vegetation near it.; Format: image/photograph

Cactus on the Lost Mine Trail: Many different varieties of cacti can be found in Big Bend National Park. This photograph shows a cactus which is beginning to bloom. Its purple flowers have yellow centers.; Format: image/photograph

Rocks along the Hot Springs Trail: These rocky outcrops are what is left of mountains that have eroded over millions of years. This area can be seen along the Hot Springs Trail in Big Bend National Park.; Format: image/photograph

LEARN NC, a program of the University of North Carolina at Chapel Hill School of Education, finds the most innovative and successful practices in K–12 education and makes them available to the teachers and students of North Carolina — and the world.