Chemistry
Despite containing zinc, brass is often confused with this alloy, which is 90% copper and 10% tin.
Bronze
Males have one X and one Y form of this genetic structure that contains packaged DNA.
Chromosome
The Sea of Tranquility, the landing point of Apollo 11, is on this body, Earth's only natural satellite.
Moon
Nebraska and Kansas are in the heart of these events' namesake "alley," and are defined as columns of intensely spinning wind.
Tornadoes
This type of material is made up of fibers like yarn or string twisted together or woven together to create tensile strength for pulling.
Rope
This particle is composed of two up quarks and one down quark.
Proton
The atrium is the smaller upper chamber of this organ that primes this organ's ventricles to pump.
Heart
This body is orbited by the moon Charon, which is nearly half its size.
Pluto
This material is finer than gravel but coarser than silt and can be heated to form glass.
Sand
These objects produce real and virtual images depending on whether they are concave or convex.
Lens
Interactions named for this element hold together DNA strands.
Hydrogen
This animal's scientific name, Ailuropoda melanoleuca, incorrectly identifies this animal as a black-and-white cat.
Panda
The MESSANGER probe orbited this planet for 4 years before entering the final phase of its mission and crashing to the surface.
Mercury
Fjords are created by these objects when they cut through bedrock.
Glaciers
The double variety of this device displays chaotic motion, and in 1656, Christiaan Huygens invented a clock that kept time with this device.
Pendulum
Robert Muliken devised a scheme for calculating this quantity that takes the arithmetic mean of the first ionization energy and electron affinity.
Electronegativity
This organ has sebaceous glands that secrete fluid, and vitiligo affects this organ.
Skin
The energy from these objects can hypothetically be captured using a Dyson sphere.
Stars
Pedalogy is the study of this substance whose profile is made up of the O, A, B, C, and R horizons.
Soil
The behavior of these substancces are governed by a set of relations called the Navier-Stokes equations.
Fluid
An isotope of this element is bombarded with neutrons in a method for producing tritium
Lithium
Some species of cuckoo birds participate in the brood form of this relationship by laying eggs in other birds' nests.
Parasitism
The Cassini probe was sent to study this celestial body and its storms are often called Great White Spots
Saturn
This biome is the primary home of the rock ptarmigan [tar-me-gan], whose Svalbard variety is a terrestrial bird unique to the archipelago.
Tundra
In quantum mechanics, the Hamiltonian operator describes the total sum of this property for a system.
Energy