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fosilised animal
bunch of natural sponges
...an old Spanish coin, a means of payment from the Iberian Peninsula made of metal
prismatic quartz mineral clusters on rock specimens from the UK
rough round agate mineral sample with outer shell geode
Acid sulphate mudpool at the Sulphur Flats in Rotorua, New Zealand.
Apache tear (obsidian) from the USA
chinese medicine Rhizoma Cibotii, Cibotium barometz
Other types of mushrooms have pores instead of gills. Like gills, pores produce spores, but they appear as small, sponge-like holes instead of thin blades. The little holes lead to tubes inside the cap. As spores mature, they eventually fall from the tubes out of holes and into their environment.
Frozen Puddle in the Meadow, Canada
internal tissue of a sea creature's shell. pores. macro photo.
Concretion formations in a rock in the Grand Staircase-Escalante National Monument in southern Utah during the fall. Concretions are precipitated mineral deposits that form in the spaces of sedimentary rock.
Beautiful Stone texture and background. Rock texture. Seamless rock texture bakground closeup
Photomicrograph of freshwater leech. Sucker attached to cover slip at bottom. Live specimen. Wet mount, 2.5X objective, transmitted brightfield illumination. Note - motion blur of live animal, very shallow depth of field, chromatic aberration and uneven focus are inherent in light microscopy.
Waste water and dirty foam pollute the environment. Sewage or industrial waste
Cross section of rock  backgrounds
Boiling water bubbler Geyser. Active geyser with major eruptions. Yellowstone NP, Wyoming, USA
Intricate architecture of a multi-layered nest
Spider webs on dead cactus
Ammonite in limestone rock (Bavaria, Germany)
Petrified Forest National Park, a natural attraction place with many petrified tree trunks and fossils, in Arizona, USA.
Calama, Chile
Hand made cross section of a branch from a knotweed plant, Reynoutria japonica, showing the cortex at 40x with polarization.
Mica, silicate phyllosilicate.
Stones texture nature background photo, High Resolution for 3D.
A scenic view of one of the many lava fields on Bartomome Island.  Bartolome is one of the youngest islands in the Galapagos and displays a fantastic landscape of lava formations.
color natural mineral collection as nice background
Rock and weed textures
Man-O-War Jellyfish
Dry earth background
Free Images: "bestof:Hoplopariabearpawensis.jpg Hoploparia bearpawensis en fossil on display at the San Diego County Fair California USA own Stickpen 2010-06-16 Hoploparia"
Calochortussplendens2.jpg
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Young female mummy from near Lupo, Peruvian Andes, about 550 years old - San Diego Museum of Man - DSC06926.JPG
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San Francisco Conservatory of Music - DSC01305.JPG
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San Francisco Conservatory of Music - DSC02724.JPG
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Unidentified glass fruit - De Young Museum - DSC00305.JPG
Gorilla gorilla - San Francisco Zoo - San Francisco, CA - DSC03909.jpg
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View-of-Stow-lake-at-San-Francisco-Golden-Gate-Park.jpg
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Reliefs - Spreckels Temple of Music - San Francisco, CA - DSC05238.JPG
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Birds and varmints - Museum of Wildlife and Fish Biology - University of California, Davis - DSC03327.JPG
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Balboa parks towers fountains night.jpg
Long exposure shot from Coronado island.jpg
Balboa park crowds nighttime palm trees lights.jpg
Sunset at la jolla shores.jpg
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