IMG_4165

" Bouguer pran 1ty anomalies beneath high mountain ranges are usually i negative, indicating the lithospheric density lower than average B positive, indicating the lithospheric density greater than average . about zero d. same as in the oceans X' & The increasc in the Earth's normal gravity from the equators to the poles is caused by @Earth's rotation b. geomagnetic dynamo surface topography d. vanations in subsurface density ,Z 9. Thenu:p t;cr of major plates making up the lithosphere ais2 b.is 12 c.is112 d. has changed several times in the last five thousand years — )6 The Cascade volcanoes in the U. a spreading ridge a convergent plate boundary ¢. a descending mantle plume d. none of the above S. Pacific Northwest are formed over [} ‘ iz }'f The most abundant element in the Earth's crust is , and the most 7~ abundant mineral group in the Earth's crust is a. aluminum and oxides oxygen and silicates ¢. silicon and carbonates @) iron and silicates J2. Which of the following minerals has an internal structure based upon sheets of silica tetrahedra? Quartz . Feldspar € Mica d. Olivine }’3. Clay minerals often cause foundation problems because they expand upon increases in water content. The most expansive clay mineral is . fluorite . montmorillonite c. galena Whematite 14. The chemical formula Fe;0s describes the mineral ® hematite b. orthoclase ¢. chalcopyrite d. homblende 15. Hot-spring deposits composed of calcite fall into the a. sulfate mineral grou b. silicate mi_ N - 1