The answer is D, 15,000 x 0.2= 3000 add that together =18,000
        
             
        
        
        
The thoracic cavity is superior to the abdominopelvic cavity. <span>thoracic cavity is also known as chest cavity while abdominopelvic cavity is the body cavity that consists of abdominal cavity and pelvic cavity.</span>
        
             
        
        
        
Answer:
Seismic waves traveled at varying speeds.
Explanation:
The Moho Discontinuity was discovered by one Croatian seismologist, Andrija Mohorovicic. He realized that the speed of a seismic wave depends on the density of the material the wave is moving through. Mohorovicic interpreted the acceleration of seismic waves observed within the Earth's crust as a change in composition of matter within the Earth.