What are trace elements and how are they useful to forensic scientists ?

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a.the kinetic energy increases.b.the kinetic energy decreases.c.the kinetic energy remains the same.d.the kinetic energy is always zero.

Which type of basaltic lava flow has a fairly smooth