The origin of the erosion features seen on the surface of Mars appears to be due to
A) runoff after rainfall
B) erosion by water-rich debris flows
C) an underground source
D) one or more of these
D
You might also like to view...
Why is Earth's inner core solid?
A. due to the tremendous pressure of overlying material B. due to extremely high temperature C. due to the spinning of earth D. Earth formed by liquid material piling on top of a solid sphere.
Substitute the correct prefix to the fun-word "103-mockingbird"
A) deci B) tera C) peta D) pico E) kilo
A railroad freight car, mass 15 000 kg, is allowed to coast along a level track at a speed of 3.0 m/s. It collides and couples with a 54 000-kg loaded second car, initially at rest and with brakes released. What percentage of the initial kinetic energy of the 15 000-kg car is preserved in the two-coupled cars after collision?
a. 78% b. 22% c. 18% d. 38% e. 14%
A jet engine develops 2.0 × 10^5 N of thrust in moving an airplane forward at a speed of 900 km/h. What is the power developed by the engine?
a. 500 kW c. 25 MW b. 10 MW d. 50 MW