The type of seismic waves that arrive at the surface first and move by compressing and expanding the ground like an accordion are called a. S waves. b. P waves. c. Surface waves. d. Mercalli waves. Please select the best answer from the choices provided A B C D

B. P -waves

Explanation:

P waves, also known as Primary or Pressure waves travel through the air with high velocity as sound waves. They are mechanical waves propagated by alternating compressions and expansion of the medium through which they travel.

The particles travel as a longitudinal wave motion, parallel to the direction of the wave propagation.

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answer; i do believe the correct answer is (river); /// good luck

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.