16.5: Earth's History- Challenge 1
- Page ID
- 5586
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- 1. The inner planets are made primarily of ___.
- dense rock and metal
- 2. ___ brings gas and dust together to form new stars.
- Gravity
- 3. The planets formed because ___.
- clumps of material orbiting what would become the Sun continued to collide with each other due to gravity
- 4. Earth formed ___ as the other planets.
- at about the same time
- 5. Earth's early crust probably ___.
- recycled into the mantle because of vigorous convection
- 6. Earth's interior separated into layers based on density through the process of ___.
- differentiation
- 7. The ___ ratios of the Moon and Earth indicate that they originated in the same part of the solar system.
- oxygen isotope
- 8. The Moon formed when ___.
- a Mars-sized asteroid hit Earth
- 9. The material that came together to form the Moon was flung into space from ___.
- Earth
- 10. Earth's first atmosphere was made up of ___.
- carbon dioxide, ammonia, hydrogen, and water vapor
- 11. Oxygen appeared in Earth's atmosphere though ___.
- photosynthesis
- 12. The ozone layer protects Earth's surface from ___.
- ultraviolet rays