Question

6. Pitch of sound is determined by its
(a) Frequency
(c) speed
(b) Amplitude
(d) loudness
7. The outermost layer of earth is called
Mental.
(c) crust
(b) Outer core
(d) inner core
8. The movement of the earth's plates causes
(a) Cyclones
(c) earthquakes
(b) Lightening
(d) thunderstorms
9. An electroscope is a device which is used to an object is
(a) Charged
(c) free of cracks
(b) Magnetic
(d) hot​

Answer 1

Answer:

Explanation: frequency

                      crust

earthquakes

charged