Which of the following best describes a cinder cone?
a. a volcano that erupts flowing, molten lava
after it blasts out pyroclastic material
b. a tall volcano that is covered in hardened
pahoehoe lava flows
c. a volcano that has been erupting pillow
lava underwater for several hundred years
d. a short, steep volcano that blasts out
pyroclastic material

A cinder cone is a short, steep volcano that blasts out

pyroclastic material.

Explanation:

A cinder cone is basically a sharp conical hill which consist of a loose pyroclastic fragments that are being formed on the sides on volcanic vent.

Simply think of a steep volcano and how it acts when it blats out, this is what cinder cone is. When the lava is blown out in a very violent manner, it breaks in to very small particles that can be addressed as cinder. Almost all the cinder cones are made up of pyroclastic substance.

Explanation:

a)According to ideal gas equation, when two gases of V1 and V2 volumes add then we need to add the number of moles of each gas. Since in this case, pressure and temperature is same hence volumes would simply add

Volume of O2 = 0.3

Volume of N2 = 0.5

Volume of mixture  = 0.3+ 0.5 = 0.8

b)According to kay's rule,

We take the portion of each gas and compute it with respect to its temperature and then add these both. In our case, since temeperature is same so volumes would simply add up

Volume of mixture  =  0.8

C)According to Amagat's law,

In this case, the compressibiity factor would be unity because the temeperature of both gases and mixture is same.

Volume of mixture  =  0.8