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Illustration of copper electrode, as cathode electrons arrive from zinc anode via external circuit, they reduce hydrogen ions from acid, forming hydrogen gas molecules
Illustration of zinc atoms in electrode dissolving in acid, losing electrons to form cations
Illustration of copper ion reduced to copper atoms by electrons on battery, on surface of brass key cathode
Illustration of neutral pH (pure water), a measure of acidity in chemistry
Illustration of catalysis with reactants approaching surface with one of the reactants being a diatomic molecule
Illustration of two Sea Urchin (Echinoidea), shell, also known as test, on beach
Illustration showing relative atomic mass of nucleus of boron-11 containing five protons and six neutrons
Illustration of white eggs of Garden Snail (Helix aspersa) in shallow hole under decaying leaves
Illustration showing circular bed of culinary herbs
Electrons spinning around nucleus of an atom
Digital illustration of ruler on piece of timber and marking end with loop to square up timber
Illustration of round wire nail, and oval and lost head
Digital illustration countersunk, raised, round, and pan screw, heads
Black and white illustration of rounded form Hosta leaf
Digital illustration representing hands of clock symbol in green circle
Digital illustration of fuel pump in circle with diagonal line through center
Digital illustration of pint of beer in circle with diagonal line through center
Digital illustration of pan in orange circle
Digital illustration of representing knife and fork in purple circle
Digital illustration of primary and secondary colour circle
Digital illustration of lumbar puncture using spinal needle inserted into lumbar vertebrae and dura mater
Illustration of detail from mosaic found in ancient Iskenderun, Turkey
Black and white digital illustration of clenched fist in black circle
Digital illustration representing crescent moon and stars in blue circle
Black and white digital illustration of two clenched fists in black circle
Digital illustration representing egg in pink circle
Digital illustration representing bottle in blue circle
Digital illustration representing houseplant care symbols in colour circles
Digital illustration representing SLR camera aperture
Black and white digital illustration of cupped hand in black circle
Black and white digital illustration of two cupped hands in black circle
Digital illustration representing ear of wheat in pink circle
Digital illustration of circular bus lane sign
Digital illustration of car and fuel pump in circular sign
Black and white digital illustration of weight hanging from circle
Black and white digital illustration of vapour trail looping behind military jet
Digital illustration of showing shape and volume of solid gas, and liquid gas taking shape of conica
Digital illustration of blue tick symbol in white circle
Man using hands to position circle of sand paper on edging sander
Illustration of magnetic field around a wire
Illustration of stellar cycle, material discarded by mature star becoming part of cloud that in turn
Illustration of planet orbiting sun, moving faster when nearer the sun
Illustration of crop rotation cycle
Illustration of a Wood pigeon (Columba palumbus) in a nest
Illustration of solar system with path of Halleys comet
Model of landform evolution in the prehistoric era, including Quaternary, Tertiary, Cretaceous, Jurassic, Triassic, Permian, Carboniferous, Devonian, Silurian, Ordovician, Precambrian periods
Illustration of a comets tail around the sun
