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Across 2. The Earth is the densest major body in the _________ system 3. The crust on Earth is primarily ____________ 4. The outer belt of earth stretches 19,000 km in ___________ to 41,000 km 7. Earthquakes are much more ____________ at the plate boundaries 11. Earth is the_________ planet from the Sun 12. The_________ effect raises the average surface temperature about 35 degrees celsius 13. Earth's crust varies considerably in ___________ 15. Earth has a modest magnetic field produced by electric currents in the _______ core 16. There are __________ major continental plates on Earth 17. The Earth is approximently ________ billion years old 18. ________is the most abundant element in the Earth's core

Down 1. Most of the mass of the Earth is in the________ 5. ________ at the center of the core may be as high as 7500 Kelvin 6. Earth is the only planet on which _________ can exist in liquid form on the surface 8. The Earth's atmosphere is primarily___________ 9. The Earth is divided into several ___________ which have distinct properties 10. Earth is the_________ largest planet 14. The inner core and________ are solid