science

4. the emission of energy in the form of ionizing radiation.
9. a chunk of rock or iron that has landed on the ground after surviving a fiery passage through the atmosphere.
10. a loose sleeveless garment worn over other clothes : cloak b : a figurative cloak symbolizing preeminence or authority accepted the mantle of leadership.
11. Tectonic plates are composed of the oceanic lithosphere and the thicker continental lithosphere, each topped by its own kind of crust.
13. the outermost layer of Earth's lithosphere that makes up the planet's continents and continental shelves
14. When two plates come together,
17. the more stable form
18. In nuclear and particle physics, a geoneutrino is a neutrino or antineutrino emitted during the decay of naturally-occurring radionuclides in the Earth.
20. heat-driven cycles that occur in the air, ocean, and mantle

1. vibrations in the earth that transmit energy and occur during seismic activity such as earthquakes, volcanic eruptions, and even man-made explosions.
2. occurs when two tectonic plates move away from each other.
3. the rigid outer part of the earth, consisting of the crust and upper mantle.
5. formed where two tectonic plates pass laterally by one another
6. The original unstable isotope
7. the denser crustal layer of Earth that makes up portions of tectonic plates in deep oceans.
8. Radiometric dating calculates an age in years for geologic materials by measuring the presence of a short-life radioactive element, e.g.
12. a hot, dense ball of (mostly) iron
15. a fluid layer about 2,260 km
16. region of the upper atmosphere between about 50 and 80 km (30 and 50 miles) above the surface of the Earth
19. the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.