Which have scientists learned from studying seismic waves that travel through earth’s interior?

a. the outer core of earth is solid.

b. they have learned the precise depths where the boundaries between the earth's layers are located.

c. the inner core of earth is liquid.

d. earth's mantle is liquid.

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd question 6 options: 3000 joules 30 joules 320 joules 3200 joules

Atotal charge of –6.50 µc is uniformly distributed within a sphere that has a radius of 0.150 m. what is the magnitude and direction of the electric field at 0.300 m from the surface of the sphere? a) 2.89 × 105 n/c, radially inward b) 6.49 × 105 n/c, radially outward c) 4.69 × 105 n/c, radially inward d) 9.38 × 105 n/c, radially outward e) 1.30 × 106 n/c, radially inward

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.