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Which non-metallic element is notable for being in a liquid state at normal room temperature, unlike most other non-metals?
ASulfur
BChlorine
CIodine
DBromine
The colorful natural light display known as the Aurora Borealis, or Northern Lights, is primarily caused by what phenomenon?
ASunlight refracting through ice crystals
BReflections of city lights off low clouds
CCharged particles from the sun interacting with Earth's magnetic field and atmosphere
DVolcanic activity beneath the polar ice caps
Which metal has the highest melting point of any metal and is commonly used for the filament inside traditional incandescent light bulbs?
AZinc
BAluminum
CCopper
DTungsten
Albert Einstein’s 1921 Nobel Prize in Physics was awarded specifically for his explanation of which phenomenon, rather than for his theory of relativity?
ANuclear fission
BThe discovery of the electron
CThe theory of general relativity
DThe photoelectric effect
What term describes the minimum speed an object must reach to break free from a planet’s gravitational pull without further propulsion, such as the roughly 11.2 kilometers per second required to leave Earth?
AOrbital velocity
BAngular velocity
CEscape velocity
DTerminal velocity
Which lightweight, corrosion-resistant metal is the most abundant metallic element found in Earth’s crust?
AIron
BCopper
CGold
DAluminum
Which technology relies on signals from a network of orbiting satellites to determine a device’s precise geographic location?
AWi-Fi
BGPS, or the Global Positioning System
CSonar
DRadar
Why do astronauts aboard the International Space Station experience apparent weightlessness, even though Earth’s gravity is still acting on them?
ABecause there is no gravity at all in space
BBecause astronauts wear special anti-gravity suits
CBecause the station and its occupants are continuously falling around Earth in orbit, creating a state of continuous free fall
DBecause the station generates artificial zero gravity fields
What term describes an alloy, historically used in dental fillings, that is formed by combining mercury with another metal?
ASolder only
BBrass
CBronze
DAmalgam
What is a geostationary satellite, commonly used for communications and weather monitoring?
AA satellite that orbits the moon rather than Earth
BA satellite that only operates during nighttime
CA satellite that remains fixed at a single point relative to Earth's surface because its orbital speed matches Earth's rotation
DA satellite that never orbits Earth at all