Another name for cyanobacteria, the earliest evidence of ancient life, is
a. blue-green algae.
b. amber.
c. foraminifera.
d. coal.
a
Physics & Space Science
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Ammonia is mixed with water in a ratio of 1 part ammonia to 4 parts water (by volume) and used as a cleaning agent for floors. Estimate the evaporation rate of the ammonia per unit area if the process occurs at 25ºC. Assume air is moving over the surface at 5 m/s.
What will be an ideal response?
Physics & Space Science
Which subatomic particle or particles is/are found in the nucleus of an atom?
A) protons and neutrons B) protons only C) neutrons and electrons D) electrons and protons
Physics & Space Science
The most abundant materials in the solar nebula were
A) hydrogen compounds like water, methane, and ammonia B) hydrogen and helium gases C) metals D) rocks
Physics & Space Science
On average, the highest amounts of precipitation occur in this zone.
Physics & Space Science