Which of the following secrete gases in order to stay afloat?
A. chambered nautilus
B. portuguese man-of-war
C. portuguese man-of-war and chambered nautilus
D. squid
E. portuguese man-of-war, chambered nautilus, and squid
Answer: C
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Rare-earth metals are actually not as rare as once thought to be.
Answer the following statement true (T) or false (F)
There are electrons in the filament of the AC lamp in your bedroom. When you turn on the lamp and it glows, the glowing comes from
A) different electrons; the ones that flow in the circuit to your lamp. B) the same electrons. C) the positive charges that flow in the filament.
The density of Earth's crust, mantle, and core increases moving toward Earth's center because
A) Earth's elements are distributed evenly throughout its interior. B) Early in Earth's history, it separated into layers according to density. C) Earth is plastic throughout its structure today and in the past. D) The charged particles flowing in the outer core repel the lighter elements found at Earth's surface.
An isotope of oxygen has 8 protons, 10 neutrons, and 8 electrons. What is the atomic mass of this isotope?
A) 16 B) 18 C) 21 D) 26