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Leiden leaf c.s. under microscope
Magnified close up of porphyritic granite with fledspar.
Is igneous rock formed by slow cooling from vulcanic magma of basaltic composition
Acute ordinary hepatitis liver biopsy under light microscopy
Petrified wood, 20 million years old wood. Wood turned into stone
A 1998 Austria postage stamp with an illustration of a landscape scene within Kalkalpen National Park in Upper Austria; postmarked in Vienna (Wien).
A chert conglomerate from the Fig Tree Formation of the Barberton greenstone belt
Piece of natural mineral gemstones in gift store
Epidermis. Electron microscope micrograph showing a keratinocyte of spinous layer. The epithelial cell has a polygonal shape, central nucleus with nucleolus, cytoplasm full of keratin filament bundles, and numerous dark desmosomes crossing the intercellular spaces.
Mikroklin Amazonit Kristall peak Teller County, Colorado
Big natural stone green amber on white background
plant Flower bud of Lilium brownii var.viridulum T.S.\nunder light mircoscope with white background
a sample of minerals from nature
Magnified close up of an igneous rock with metallic minerals in the cracks.
This is a agate is a semi-precious stone photographed in the studio with a flash
nephrite mineral stone
Transmission electron microscope (TEM) micrograph showing dark melanin granules in a melanocyte (top center) and in several keratinocytes, which, unlike melanocytes, have bundles of keratin filaments
Mineral, pink Charoit
boulder opal from Queensland, Australia isolated on white background
Blastomycosis is a fungal infection caused by inhaling Blastomyces dermatitidis spores. If it involves only the lungs, it is called pulmonary blastomycosis. Only about half of people with the disease have symptoms, which can include fever, cough, night sweats, muscle pains, weight loss, chest pain, and feeling tired.
Details of a fragment of a quartz crystal geode
Tasty nori seaweed as a background. Top view.
Agate is a microcrystalline variety of quartz, chiefly chalcedony, cryptocrystalline form of silica.  Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks but can be common in certain metamorphic rocks. Most agates occur as nodules in volcanic rocks or ancient lavas where they represent cavities originally produced by the disengagement of volatiles in the molten mass which were then filled, wholly  by siliceous matter deposited in regular layers upon the walls. Cathedral Valley, Capitol Reef National Park, Utah.
The stalactites are in wooden trays in an exhibition hall
Tiger’s eye mineral stone sample macro photography
Picture of Serpentine stone isolated on a background.
Magnified close up of a white and black speckles.
moldavite minerals isolated
Dumortierie crystal background.
Free Images: "bestof:Fig15-Lyell.jpg Figure 15 Figures from the book Student's Elements of Geology 1870 Charles Lyell Free for all use PD-old Figures from Student's Elements of"
Female student with open tree identification book looking at tree leaves to identify species.jpg
Hoplitis_simplex,_m,_side,_Charles_Co,_MD_2016-04-15-22.49.jpg
Hoplitis_simplex,_m,_back,_Charles_Co,_MD_2016-04-15-22.29.jpg
Hoplitis_simplex,_m,_face,_Charles_Co,_MD_2016-04-15-22.38.jpg
Lewis_Carroll_-_Henry_Holiday_-_Hunting_of_the_Snark_-_Plate_10.jpg
Lasioglossum_platyparium,_f,_back,_Charles_Co.,_MD_2016-03-15-22.17.jpg
Lasioglossum_platyparium,_f,_side,_Charles_Co.,_MD_2016-03-15-23.30.jpg
Lasioglossum_platyparium,_f,_face,_Charles_Co.,_MD_2016-03-15-22.52.jpg
Stanisław Samostrzelnik, Św Stanisław.jpg
Charles_Townshend,_2nd_Viscount_Townshend_by_Sir_Godfrey_Kneller,_Bt_(2).jpg
Monument_Symbolism:_Female_Figure.jpg
united-kingdom-scotland-roslin-1672630.jpg
Libation Macron Louvre G149.jpg
architecture-building-germany-home-253904.jpg
Girl_sitting_on_the_grass.jpg
school-book-know-study-education-1661731.jpg
school-book-know-read-learn-1661730.jpg
Fluoresce figures.jpg
Student walking by the main entry building.jpg
Student walking across the patio.jpg
Black metal figures.jpg
Three figures.jpg
Palaistra_scene_Louvre_G457.jpg
An event leader helps an archery student practice her skills.jpg
Student being shown by teacher how to correctly hold bird being prepared for banding.jpg
Student carefully marks an turtle egg which notes its orientation in the nest.jpg
Student pouring river water into beaker held by teacher and service employee overseeing in background.jpg
Teacher handing student wetland plants to put in newly established pond.jpg
A young student pretends to extinguish the flames of a pretend fire.jpg
An environmental education student gets to feel the back of a young alligator on the refuge.jpg
Ruby_2015-08-07-18.04.36_ZS_PMax_UDR.jpg
Intercession_of_Charles_Borromeo_supported_by_the_Virgin_Mary_-_Detail_Rottmayr_Fresco_-_Karlskirche_-_Vienna.JPG
cerambycid,_u,_face_side,_md,_pg_county_2014-06-18-15.38.28_ZS_PMax.jpg
cerambycid,_u,_side,_md,_pg_county_2014-06-18-17.13.15_ZS_PMax.jpg
Giorgione_-_Sleeping_Venus_-_Google_Art_Project_2.jpg
cerambycid,_u,_face_close,_MD,_pg_county_2014-06-18-15.26.53_ZS_PMax.jpg
Yard gate.jpg
Metal door.jpg
Brick storefront.jpg
Seaside castle wall.jpg
Anglican church door.jpg
Carvings statue.jpg
Gallery windows.jpg
Turtle wall decoration.jpg
Flowered window with shooter.jpg
Iron fence on window.jpg
Old antique window.jpg
Ornate yard gate.jpg
Red door and window.jpg
Weathered barn wood.jpg
Window fence.jpg
Windows blinds drapes.jpg
Wasp,_U,_Face,_MD,_Wicomico_County,_Groundworks_Farm_2015-08-25-15.56.40_ZS_PMax_UDR.jpg
copper_oxide,_Helen_Folger_2015-08-07-13.52.41_ZS_PMax_UDR.jpg
Fluorite,_Helen_Folger,_with_foil_2015-08-07-17.50.41_ZS_PMax_UDR.jpg
Trichothurgus_aterimma,_m,_side,_clean_chile_2014-07-26-15.49.38_ZS_PMax.jpg
Stalactites_Stalagmites,_End,_VT,_Jefferson_Memorial_2015-08-07-12.12.07_ZS_PMax_UDR.jpg
Unique style of house construction.jpg
Bricks on house front wall art work.jpg
Entrance gate big gate from metal pipes.jpg
Old iron work on entrance door.jpg
Old iron work on window.jpg
Map_of_Lewis_and_Clark's_Track,_Across_the_Western_Portion_of_North_America,_published_1814.jpg
A_Professional_Pickaninny.jpg
Homeland Security; World Trade Center; Steel Fireproofing (5941047642).jpg
Haggadah_14th_cent.jpg
Lasioglossum_lilliputense,_F,_Face,_WY,_Teton_County_2015-06-08-15.30.48_ZS_PMax.jpg
Osmia_trevoris,_F,_Park_Co.,_Wyoming,_side_2015-11-21-00.15.51_ZS_PMax_UDR.jpg
Ancyloscelis_ursinus,_m,_side,_paraguay_2014-08-06-15.41.34_ZS_PMax.jpg
Edwyniana_near_flavicornis,_f,_00605f08,_face,_chile_2014-08-04-15.50.28_ZS_PMax.jpg
Ceratina_tricolor,_f,_panama,_back_2014-08-29-15.54.43_ZS_PMax.jpg
Lasioglossum_sedi,_F,_Side,_UT,_Garfield_County_2014-05-27-17.11.12_ZS_PMax.jpg
Velvet_Ant,_F,_Side,_Hot_Springs_Village,_AR_2015-08-20-15.39.20_ZS_PMax_UDR_copy.jpg
Edwyniana_near_flavicornis,_f,_00605f08,_back,_chile_2014-08-04-15.34.16_ZS_PMax.jpg
Edwyniana_near_flavicornis,_f,_00605f08,_abdomen,_chile_2014-08-04-15.15.45_ZS_PMax.jpg
Panurginus_calcaratus,_f,_facd,_Norway_2014-08-06-09.15.21_ZS_PMax.jpg
Megachile_brevis,_female,_back_2012-06-15-17.30.jpg
Osmia_versicolor,_F,_Side,_Greece,_Aegean_Islands,_Lesvos,_Mytilene_2015-02-19-15.48.22_ZS_PMax.jpg
Perilampus_fulvicornis_(tent),_F,_Side,_MD,_Baltimore_County,_Hart-Miller_Island_2014-07-10-15.18.21_ZS_PMax.jpg
Perilampus_fulvicornis_(tent),_F,_Back,_MD,_Baltimore_County,_Hart-Miller_Island_2014-07-10-15.09.31_ZS_PMax.jpg
Lasioglossum_glabriventre,_F,_Face1,_WY,_Lincoln_County_2014-06-20-16.15.37_ZS_PMax.jpg
paranomada_velutina,_f,_arizona,_face_2014-08-09-15.30.33_ZS_PMax.jpg
paranomada_velutina,_f,_arizona,_angle_2014-08-09-15.21.39_ZS_PMax.jpg
Osmia_sandhouseae,_U,_side,_Georgia,_Camden_County_2013-01-16-15.28.44_ZS_PMax.jpg
Perdita_halictoides,_F,_face,_Florida,_St._Johns_County_2013-03-05-15.20.19_ZS_PMax.jpg
Bombus_fervidus,_f,_back,_National_Arboretum,_DC_2016-04-15-19.46.jpg
Nomada_Bidentate_Group,_Face_2016-06-27-15.34.jpg
Andrena_heraclei,_m,_side,_2016-04-05-15.26.jpg
Ceratina_species,_m,_side,_bright_green,_San_Francisco,_CA_2016-05-04-15.56.jpg
Ceratina_species,_m,_head,_bright_green,_San_Francisco,_CA_2016-05-04-15.48.jpg
Lasioglossum_seillean,_F,_face,_New_Hampshire,_Coos_County_2015-10-15-15.34.jpg
Dufourea_novaeangliae,_f,_side,_Washington_Co,_ME_2016-04-15-21.47.jpg
Stelis_lateralis,_F,_face,_New_York,_Kings_County_2013-03-05-15.40.jpg
Dufourea_novaeangliae,_f,_face,_Washington_Co,_ME_2016-04-15-21.28.jpg
Eucera_aragalli,_f,_face,_Pennington_Co,_South_Dakota_2015-12-01-13.15.jpg
Nomada_Bidentate_Group,_Side_2016-06-27-15.43.jpg
Nomada_maculata,_m,_left_side,_Charles_Co._Maryland_2016-06-27-17.12.jpg
Nomada_maculata,_m,_back,_Charles_Co._Maryland_2016-06-27-16.44.jpg
Dynastes_tityus,_f,_side_face,_MD_2016-02-24-15.16.jpg
Megachile_latimanus,_m,_back,_Maine,_Du_Clos_2015-12-01-15.56.jpg
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