What is one reason why rock layers are not horizontal?

a. they was formed at an angle
b. the area was once covered by water
c. a forced pushed the rock layers after they were forced

d. they were forced veritcally

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

In an experiment, how can i change human errors? be specific.