The principle of superposition states that the top layer of rock is
A) igneous.
B) the youngest.
C) sedimentary.
D) the oldest.
Answer: B
Physics & Space Science
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The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents stars with the longest main-sequence lifetimes?
A) a B) b C) c D) d E) e
Physics & Space Science
Briefly explain how we think quasars produce so much energy
What will be an ideal response?
Physics & Space Science
The proper abbreviation for ‘seconds' is __________
Fill in the blank(s) with correct word
Physics & Space Science
If a particle in a box has a ground-state energy of 10.0 eV, what is the energy of the 4th excited state?
A. 20.0 eV B. 40.0 eV C. 160 eV D. 50.0 eV E. 250 eV
Physics & Space Science