1. At what depth will ascending mantle rock with a temperature of 1800°K melt if the equation for the solidus temperature T is

Assume density = 3300 kg m^-3, g = 10 m s^-2.

2. Determine the velocity of seafloor spreading on the East Pacific Rise from the magnetic anomaly profile given below.

3. Determine the declination and inclination of the earth's magnetic field at Chicago (Lat. 41.8°, Long: -87.5°). Use the dipole approximation to the field, but do not assume that the geographic and magnetic poles coincide.

4. What is the spreading rate between the North American and Eurasian plates in Iceland (65°N, 20°W)?

5. Consider a RRR triple junction of plates A, B, and C. The ridge between plates A and B lies on a north-south direction (an azimuth of 0° with respect to the triple junction) and has a relative velocity of 60 mm/yr-1. The ridge between plates B and C has an azimuth of 120° with respect to the triple junction, and the ridge between plates A and C has an azimuth of 270° with respect to the triple junction. Determine the azimuths and magnitudes of the relative velocities between plates B and C and C and A.