How can a hydrogen atom, which has only one electron, have so many spectral lines?
A) The electron is able to move at various speeds.
B) The protons in the nucleus are also giving off various light frequencies.
C) One electron can be boosted to many different energy levels.
D) The atomic radius of the hydrogen atom is relatively large.
C
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What is a prevailing wind?
A ________ can transform a v-shaped valley into a u-shaped valley
Fill in the blank(s) with the appropriate word(s).
Coal would not be considered a renewable source of biomass energy because ________
A) it was not formed from living organisms B) it does not contain organic material C) the organisms that formed the coal lived millions of years ago D) it releases carbon dioxide when burned
Glacial advances in the past have been accompanied by increased CO2 levels
Indicate whether the statement is true or false