Ultraviolet Radiation with a Wavelength Shorter Than About 200 Nm

question 53

Multiple Choice

Ultraviolet radiation with a wavelength shorter than about 200 nm is hard to observe primarily because

• A) Earth's atmosphere easily absorbs it.
• B) no space-based telescopes operate at ultraviolet wavelengths.
• C) only the lowest-mass stars emit ultraviolet light.
• D) very few objects emit at ultraviolet wavelengths.
• E) Earth emits too much ultraviolet background light.

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Definitions:

Accretion

The process of gradual growth or increase, particularly through the accumulation of additional layers or matter, especially in a cosmic or geological context.

Subducted

Refers to the geologic process where one tectonic plate moves under another and sinks into the mantle.

Tectonic Terranes

Discrete fragments of crustal material formed on, or broken off from one tectonic plate, and accreted or sutured to crust lying on another plate.

Geologic Map

A map that represents the rock formations and geologic features on the surface of the Earth, used by geologists to understand earth processes and history.