Which of the following monitors both vertical and horizontal movements along a fault?
a. seismograph
b. gps satellite system
c. richter scale
d. mercalli scale

Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

In which situation is the acceleration of a car negative? question 5 options: a)the velocity of a car was 75 km/hr over 4 hours. b)the velocity of a car reduced from 50 km/hr over one minute. c)the velocity of a car increased from 40 km. h to 75 km/h over 15 minutes. d)the velocity of a car was 45 km/hr at 2: 00pm and at 4: 00pm its velocity was 85 km/ht.