1 T F The Earth is about 4.55 billion years old 2T F Absolute age dating techniq
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1 T F The Earth is about 4.55 billion years old 2T F Absolute age dating techniques include such techniques a carbon-14 dating or U-Pb dating that return actual ages of geological materials. Absolute ages are generally expressed in years before present 3T F A mineral must be a naturally occurring inorganic solid with a definite chemical composition and ordered internal structure. TF The Mohs hardness of quartz is 7. The Mohs hardness of topaz is 8. The Mohs hardness of corundum (ruby) is 9. The Mohs hardness of diamond is 10. ST F Continental crust has a higher density than oceanic crust. This explains the observation that the surface of the continental crust is higher than the surface of the oceanic crust marks the extinction of the land-based dinosaurs, an extinction event that many geoscientists attribute to the impact of an asteroid 6 T F The Cretaceous Period ended about 65 million years ago. The end of the Cretaceous Period 7 T F Most of the Earth's tectonic plates move up to 10-15 centim per year. 8 TF The geothermal gradient is the rate at which the temperature of the Earth increases as the dep th increases. 9 T F Oceanic crust is generally thinner than continental crust 10 T FYour fingernail will not scratch the mineral talc. 11T F The chemical formula for quartz is CaCO 13 TF All of the igneous rocks that are presently found on the Earth's surface are extrusive igneous 14 T F Volatiles are substances, dissolved in the magma, which don't go into minerals as the magma 12 T F Science is a way of seeing and understanding only the present. rocks. solidifies. They are released in the form of liquids or gasses. The most abundant volatile is carbon dioxide (CO2) 15 T F Iceland is located entirely on the North American tectonic plate 16 T 17 T F F The Cambrian Period is younger than the Permian Per Plutons and batholiths are large igneous bodies that cool (crystallize) deep below the surface of the earth Felsic rocks are generally lighter colored than mafic rocks because mafic rocks include dark silicate minerals rich in al and sodium. 19 T F Graphite and diamond are polymorphs because they have the same composition but different crystalline structure d. 20 T F The Jurassic Period is younger than the Ordovician 21 T F Three types of plate boundaries are convergent, divergent, and transform. 22 T F A wire nail with a Mohs hardness of 4.5 will easily scratch quartz 23 T F A xenolith is an older fr 24 T F New oceanic crust forms only at the d 25 | T F | This lecture exam determines 15% of yo final course 26 T F igneous 27 | r rock t of rock included with a undaries s rocks are named (classified) based on texture and mineralogy (composition) F All granites contain quartz. All basalts contain T Page 1Explanation / Answer
1.As per the recent study and rock dating ,oldest rock found is of 3.9 ba and in that article they have mentioned earth's age 4.55 billion year as per rock dating presumption so it is true .
2.Carbon 14 and U-Pb dating are used to date recent rocks for relative age but they can't date the older rocks so it is false .
3.The definition of mineral :- It must be naturally formed,inorganic in nature,may have different chemical composition with specific atom arrangement and structure ,so it is true .
4.As per Mohs hardness scale quartz has harness 7 and topaz,corrundum and diamond have hardness 8,9,10 respectively ,so it is true .
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