If an S wave travels at 4 km/s to reach a seismic station 1200 km away, how much longer will secondary waves arrive after the primary waves?

What are the four basic classes of organic molecules how do they differ structurally and functionally

Which type of neuroglia is found outside of the brain?

Cathy hypothesized that corn would not grow in mud. to test this hypothesis, she took corn kernels and placed 5 in mud, 3 in soil, and 2 in water. to her surprise, the kernels in the mud grew faster than the kernels in the soil. what error might have caused these unexpected results? a. wrong hypothesis b. not enough variables c. undefined control d. too many variables