What seafloor feature, that we previously learned about, is related to a central rift valley?

The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.

The short-term effect of tar on the body is increased blood pressure.