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In the river Thjorsá on the south coast of Iceland, the melt-water from the huge ice-fields, known as ‘glacier milk’, brings about a transformation. Its quantity varies depending on the air temperature and the season, creating different patterns on the wide mud flats each day. The Thjorsá is 230 kilometre in length. It is the longest river of Iceland.

Painted Dunes, Cinder Cone Trail, Lassen Volcanic National Park by ThorsHammer94539, via Flickr

Moqui Marbles, naturally occurring iron oxide concretions that arise from navajo sandstone. Very prevalent in the Escalante Grand Staircase National Monument

This spring in a park in Dortmund, Germany, is red in colour due to the high amounts of iron sources in the water. A nearby coal pit mine, feeds water into the spring – which is where the iron sources come from.

Kliuchevskoi volcano in Russia

A rift in the Pine Island Glacier, Antarctica.

This image from NASA's Cassini spacecraft shows a vast river system on Saturn's moon Titan. The image was acquired on Sept. 26, 2012, on Cassini's 87th close flyby of Titan. It stretches more than 200 miles. Scientists deduce that the river is filled with liquid because it appears dark along its entire extent in the high-resolution radar image, indicating a smooth surface. That liquid is presumably ethane mixed with methane.

Georgian Bay

  • Corrin

    Where is this at in the Georgian bay?

The Nuvvuagittuq supracrustal belt in Quebec, composed of highly metamorphosed basalts and volcanic sediments. 4.3+ billion years in age, this is the oldest known part of the crust in the world, surviving from the Hadean eon.

Harpea’s Cave beneath folding, Spain

Columnar basalt at the Giant’s Causeway, Ireland

Geology of Giant's Causeway

Dendrites of manganese oxide precipitated on the surface of limestone. Width of view 10 cm.

Sandatlas - Page 4 of 335

This outcrop consists of visibly layered and grainy rocks but it is not sandstone. This is a pyroclastic rock (volcanic sediment) known as tuff. The outcrop is in France (The Massif Central).

Glacial milk, Perito Moreno Glacier

Eruption of Sarychev volcano on the Kuril Islands, Russia, caught by astronauts on the International Space Station.

Erupting volcanoes photographed from space - Telegraph