Can you ask your question more thoroughly?
Answer:
when sediments harden, extreme pressure increase the temperature and then take time to alter to metamorphic rocks. <3~
<u>Answer:</u> From the given gases, the greatest rate of effusion is of 
<u>Explanation:</u>
Rate of effusion of a gas is determined by a law known as Graham's Law.
This law states that the rate of effusion or diffusion of a gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

It is visible that molar mass is inversely related to rate of effusion. So, the gas having lowest molar mass will have the highest rate of effusion.
For the given gases:
Molar mass of 
Molar mass of 
Molar mass of 
Molar mass of 
Molar mass of 
The molar mass of methane gas is the lowest. Thus, it will have the greatest rate of effusion.
Hence, the greatest rate of effusion is of 
<span>Before the eruption,the fluid pressure from the rising magma (dense liquid) cracks the rocsk, the tectonic plates under the Earth's crust are moved and as a result earthquakes are caused. Manu small earthquakes in the area near a volcano hint what may happen.</span>