Twig Secondary

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A
- Absolute zero
- Absorption
- Accuracy
- Acid
- Acid rain
- Activation energy
- Adaptive divergence
- Addiction
- Aerobic respiration
- Aerosol
- Agar
- Alcohol
- Algae
- Alkali
- Alkali metal
- Alkaline earth metal
- Allele Glossary video
- Allotropes
- Alloy
- Alpha particle
- Altitude Glossary video
- Alveoli Glossary video
- Amino acid
- Amniotic fluid
- Amorphous
- Amplification of DNA
- Amplify
- Amplitude Glossary video
- Amylase
- Anaerobic respiration
- Analog
- Angiosperm
- Angle of incidence
- Angle of reflection
- Angstrom
- Anode
- Antagonistic muscles
- Antenna
- Antibiotic
- Antibiotic resistance
- Antibody
- Anticyclone
- Antigen
- Antimatter
- Antioxidant
- Aorta
- Apoptosis
- Appendix
- Aqueous
- Aquifer
- Archaea
- Artificial propagation
- Asexual Reproduction Glossary video
- Asteroid
- Astronomy
- Atmosphere Glossary video
- Atom
- Atomic mass
- Atomic number
- Atomic weight
- ATP
- Aurora
- Autoimmune disease
- Autosomal
- Autotroph
- Auxin
- Axon Glossary video
B
- Bacteria Glossary video
- Baryons
- Basalt
- Base (biology)
- Base (chemistry)
- Big Bang
- Bile
- Billion
- Biochemistry
- Biodegradable
- Biodiversity
- Biomass
- Biosphere Glossary video
- Black hole
- Blastocyst
- Blood pressure
- Boiling point
- Boyle's law
- Brittle
- Bronchi Glossary video
- Bronchiole Glossary video
- Buffer
- Bunsen burner
- Buoyancy
C
- Caldera
- Calibrate
- Carbohydrate
- Carbon dating
- Carbonate
- Carpel
- Catabolism
- Catalyst
- Cathode
- Cathode ray
- Cell cycle
- Cell division
- Cell Glossary video
- Cell wall
- Cellulose
- Cervix
- Chemical bond
- Chemical energy
- Chemical reaction
- Chemical synthesis
- Chemiluminescence
- Chlorofluorocarbons
- Chlorophyll
- Chloroplast
- Chordate
- Chromatin
- Chromosome
- Classification
- Climate
- Climatology
- Clone
- Coke
- Combustion
- Comet
- Compound
- Compound microscope
- Concave
- Concentration
- Conception
- Condensing
- Conduction
- Continental crust
- Continental Drift Glossary video
- Control
- Convection Glossary video
- Convex
- Core (biology)
- Core (Earth sciences)
- Corona
- Correlation video
- Corrosion
- Cortisol
- Cosmic dust
- Cosmic rays
- Cosmology
- Coulomb
- Covalent bond
- Crater Glossary Video
- Crude oil
- Crust
- Crystal
- Crystallization
- Cytoplasm
D
- Dark energy
- Dark matter
- Data
- Decomposition
- Delocalized electrons
- Delta
- Denature
- Denitrification
- Density
- Deoxygenated Glossary video
- Depression
- Desertification
- Diabetes
- Diatomic
- Diffraction
- Diffusion
- Digestion
- Diode
- Diploid
- Dissociate
- Dissolve
- Distillation
- Divergence
- DNA
- DNA profile
- DNA replication
- Dominant Allele Glossary video
- Doppler shift
E
- Earth
- Earthquake
- Echo
- Echolocation Glossary video
- Ecosystem
- Elastic
- Electric Current
- Electric force
- Electrical charge
- Electrode
- Electrolysis
- Electrolyte
- Electrolytic cell
- Electromagnetic radiation
- Electromagnetic Spectrum Glossary video
- Electron
- Electron shell
- Electrostatic attraction
- Element
- Elliptical orbit
- Embryo
- Emission
- Endangered Glossary video
- Endocytosis
- Endothermic Glossary video
- Energy Glossary video
- Energy level
- E-Number
- Enzyme
- Epicenter
- Epidemiology
- Epinephrine
- Equilibrium
- Erosion
- Eukaryote
- Evaporation
- Evolution Glossary video
- Exothermic Glossary video
- Extinction
- Extraction
- Extrusion
F
- Fahrenheit (°F)
- Fatty acid
- Fermentation
- Fertilization
- Fetus
- Filtration
- Flammable
- Floodplain
- Fluorescent
- Focus
- Food Chain Glossary video
- Force Glossary video
- Forensic science
- Formulae
- Fossil Fuels Glossary video
- Fossil Glossary video
- Frequency Glossary video
G
- Galaxy
- Gamete
- Gamma ray
- Gamma ray bursts
- Gas
- Gene Glossary video
- Genotype Glossary video
- Genus
- Germination
- Glacial period
- Gland
- Glucose Glossary video
- Gravitational field
- Gravity
- Greenhouse effect
- Greenhouse Gas Glossary video
- Groundwater Glossary video
H
- Hale-Bopp
- Half-life
- Halley
- Haploid
- Harmonics
- Heat Glossary video
- Heat resistant
- Hemoglobin
- Hertz (Hz)
- Heterogeneous mixture
- Homogeneous mixture
- Hormones
- Hot spot
- Hybridization
- Hydrocarbons
- Hydrophilic
- Hydrophobic
- Hydroxide
- Hyperventilating
- Hypothalamus
- Hypothesis
I
- Igneous Rock Glossary video
- Indicator
- Inert
- Infectious
- Infrared light
- Infrasound
- Inherited
- Insoluble
- Insulator
- Interference
- Interglacial period
- Intermolecular force
- Invertebrate
- Involuntary
- Ion
- Ionic bond
- Ionic compound
- Ionization
- Irritant
- Isomers
- Isotope
K
- Kilohertz
- Kinetic Energy Glossary video
L
- Laser
- Lattice
- Launch window
- Leaching
- Lens
- Light year (ly)
- Lightning
- Limestone
- Line spectra
- Linnaean hierarchy
- Lipids
- Liquid
- Lithosphere
- Longitudinal wave
- Long-period events
- Luminance
- Lunar Eclipse Glossary video
- Lymphocyte
M
- Magma
- Magnetic Field Glossary video
- Magnetic force
- Mantle
- Mass Glossary video
- Mass spectrometer
- Matter
- Mean
- Mechanical Wave Glossary video
- Median
- Medium
- Meiosis
- Melting point
- Mesosphere
- Metabolism
- Metal
- Metallic bond
- Metalloid
- Metamorphic Rock Glossary video
- Metamorphism
- Meteor
- Meteor shower
- Meteorite
- Methane
- Microorganism Glossary video
- Microwave
- Migration
- Milky Way
- Millibar (mb)
- Mineral (biology)
- Mineral (chemistry)
- Mitosis
- Modulation
- Molecular mass
- Molecular weight
- Molecule
- Molten
- Monomer
- Moon
- Motion
- Mutation Glossary video
- Myoglobin
N
- Nanomaterial
- Nanometer
- Nanotechnology
- Nebula
- Negative charge
- Neutral
- Neutralization
- Neutron
- Neutron star
- Noble gases
- Nonflammable
- Nonmetals
- Normal
- Nova
- Nuclear
- Nuclear fission
- Nuclear fusion
- Nucleation
- Nucleic acid
- Nucleosynthesis
- Nucleus (biology)
- Nucleus (chemistry)
- Nutritional value
O
- Observer
- Oceanic crust
- Octave
- Omega-3
- Ore
- Organ Glossary video
- Organic molecule
- Organism Glossary video
- Oscillate
- Osmosis
- Osteocyte
- Ovule
- Ovum
- Oxidation
- Oxide
- Oxidizer
- Oxygenated Glossary video
- Ozone layer
P
- Pangaea Glossary video
- Particle(s) Glossary video
- Peer review
- Peptide
- Periodic table
- pH
- Phagocyte
- Phenotype Glossary video
- Phloem
- Phospholipid
- Photon
- Photosynthesis Glossary video
- Pigment
- Pitch
- Planet
- Planetary nebula
- Plasma (biology)
- Plasma (physics)
- Plate boundary
- Polarity
- Polarization
- Pole
- Pollen
- Polymer
- Polyunsaturated
- Positive charge
- Potash
- Potential Energy Glossary video
- Power
- Precipitate
- Precision
- Predator
- Pregnancy
- Preservative
- Pressure
- Prey
- Primeval soup
- Prism
- Product Glossary video
- Prokaryote
- Propulsion
- Protein
- Proton
- Pure
- P-wave
- Pyroclastic flows
Q
- Quantum
- Quark
R
- Radiation
- Radio Waves Glossary video
- Radioactivity
- Rate of reaction
- Reactant Glossary video
- Reaction
- Reactivity
- Receiver
- Receptor
- Recessive Allele Glossary video
- Recombination
- Red giant
- Redox reaction
- Reduction
- Reflection
- Reflex arc
- Refraction
- Refractive index
- Renewable energy
- Resolution
- Resonance
- Resonant frequency
- Respiration
- Reversible reaction
- Ribosomes
- RNA
- Robot
- Rotation
S
- Salt
- Satellite
- Saturated fats
- Saturated solutions
- Saturn's rings
- Seafloor Spreading Glossary video
- Sediment
- Sedimentary Rock Glossary video
- Seismic waves
- Semiconductor
- Sensory
- Shockwaves
- SI
- Smog
- Solar cell
- Solar Eclipse Glossary video
- Solar flare
- Solar storm
- Solar System
- Solar wind
- Solid
- Soluble
- Solute
- Solution
- Solvent
- Sonic boom
- Source
- Spacecraft
- Species Glossary video
- Spectrometer
- Spectroscopy
- Spectrum
- Sperm
- Spontaneous
- Spontaneous emission
- Stable
- Star
- Starch
- Static electricity
- Stationary
- Stimulated emission
- Stratosphere
- Strong acid
- Strong material
- Strong nuclear force
- Subatomic particles
- Subduction
- Substance
- Substrate
- Sun
- Sunspot
- Superconductivity
- Supernova
- Supersonic
- Surface tension
- Sustainable
- S-wave
- Symbiosis
- Symptom Glossary video
- Synthetic Glossary video
T
- Taxonomy
- Telescope
- Temperate zones
- Temperature
- Tension Glossary video
- Terrestrial planets
- Theory
- Thermal
- Thermal decomposition
- Tissue Glossary video
- Topsoil
- Toxic
- Transducer
- Transform boundary
- Transmitter
- Transparent
- Transpiration
- Transverse wave
- Trench
- Troposphere
U
- Ultrasound
- Ultraviolet light
- Universe
- Unsaturated fats
- Urea
- Uterus
V
- Vaccine
- Vacuum
- Van der Waals Force
- Vaporize
- Variable Glossary video
- Vertebrate
- Vesicle
- Villi
- Virus
- Visible light
- Vitamin
- Volatile
- Volt (V)
- Volume
W
- Water Table Glossary video
- Watt (W)
- Wavelength Glossary video
- Weather
- Weathering
- Weight Glossary video
- White dwarf
- Work
- Wormhole
X
- X-Ray Glossary video
- Xylem
Z
- Zygote

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A transparent material shaped to refract light, such that it converges or diverges from a single point.

A transparent material shaped to refract light, such that it converges or diverges from a single point. Lenses for optical light are usually made of glass or hard plastic, and have probably been in use for over 3000 years

Lenses for optical light are usually made of glass or hard plastic, and have probably been in use for over 3000 years

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Science glossary film: Lens

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