Across
- 3. Show the location of mountain ranges, valleys, and other physical features of the Earth's surface.
- 5. The crust and upper mantle of the earth.
- 6. The region below lithoshere variously estimated as being from fifty to several hundred miles (eighty-five to several hundred kilometers) thick, in which the rock is less rigid than that above and below but rigid enough to transmit transverse seismic waves.
- 8. A region of space near a magnet, electric current, or moving charged particle in which a magnetic force acts on any other magnet.
- 9. The study of this science.
- 10. Measuring the depth of a body of water.
- 13. Geology. molten material beneath or within the earth's crust, from which igneous rock is formed.
- 14. Geology a long narrow, often arcuate, zone along which subduction takes place
- 15. Also called Circum-Pacific belt. the linear zone of seismic and volcanic activity that coincides in general with the margins of the Pacific Plate.
- 19. Geology. magnetic polarization acquired by the minerals in a rock at the time the rock was deposited or solidified.
- 21. The magnetic minerals in the rock having the same polarity as the Earth's present magnetic field.
- 23. A large block or tabular section of the lithosphere that reacts to tectonic forces as a unit and moves as such.
- 24. Geology that part of the earth's crust that underlies the continents and continental shelves.
- 25. The horizontal plane or level corresponding to the surface of the sea at mean level between high and low tide.
Down
- 1. A navigation and position-finding device that determines depth by measuring the time taken for a pulse of high-frequency sound to reach the sea bed or a submerged object and for the echo to return.
- 2. A tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates.
- 4. Geology. the lateral movement of continents resulting from the motion of crustal plates.
- 7. A north-south suboceanic ridge in the Atlantic Ocean from Iceland to Antarctica on whose crest are several groups of islands.
- 11. See under crust
- 12. A vent in the earth's crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervalsw
- 16. When the hot and neutral wires are wired in reverse.
- 17. A series of vibrations induced in the earth's crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating
- 18. The science or art of assembling, shaping, or ornamenting materials in construction; the constructive arts in general
- 20. Geology. The portion of the earth, about 1,800 miles (2,900 km) thick, between the crust and the core.
- 22. The hypothetical landmass that existed when all continents were joined, from about 300 to 200 million years ago.