Answer Happy

please help and explain
1. A moon is measured to have a density of 1,000kg/m3. It is composed primarily of:
A. Gas
B. Ice
C. Rock
D. Metal
2. ？The semi-major axis of a planet's moon is 0.061 Earth-moondistances. Its orbital period is 0.046 Earth lunar months. What isthe planet's mass?
A. 0.026 Earth masses
B. 0.11 Earth masses
C. 9.3 Earth masses
D. 38 Earth masses
3. ？After an earthquake, not detected on the opposite side ofEarth due to its liquid outer core:
A. P waves
B. Q waves
C. R waves
D. S waves
E. T waves
4. ？ Greenhouse gas most responsible forEarth's increasing surface temperature:
A. Carbon dioxide
B. Chlorofluorocarbons (CFCs)
C. Methane
D. Nitrous oxide
E. Water vapor
5. ？Rainbows are sunlight dispersed by raindrops, which actas:
A. Prisms
B. Reflection gratings
C. Relief gratings
D. Volume phase holographic (VPH) gratings
6. Which NASA spacecraft would you use to image a dusty cloud ofgas?
A. Spitzer B. Hubble C. Chandra D. Fermi
7. Landed on Mars using a jet-powered sky crane:
A. Viking 1 and 2B. Pathfinder/Sojourner C. SpiritD. OpportunityE. Curiosity