Geo 401 Final Exam 2023 with 100% correct answers

The oldest minerals on earth are about 4 billion years old. The accepted age of earth (4.56 Ga) is based on the - correct answer -the age of meteorites which are thought to have formed at the same time as the earth Which of the following is true of lithospheric plates on earth - correct answer -Lithospheric plates consist of upper mantle and crust Plates can join together and break apart The move at a rate of 3-10 cm a year The ______________ of the crust differs from that of the mantle - correct answer -density and chemical composition The Earth's mantle consists entirely of - correct answer -solid peridotite what controls the physical properties of a mineral - correct answer -chemical bonding Which of the following minerals is common in both felsic and mafic igneous rocks - correct answer -plagioclase feldspar A mineral that occurs in mantle rocks will have which of the following characteristics - correct answer -low Si: O ratio You find an igneous rock containing crystals too small to see with your naked eye. Luckily, you have your hand lens. You identify the minerals in the rock as quartz, feldspar, and muscovite. The rock you found most likely formed at this kind of boundary - correct answer -convergent drives melting - correct answer -decompression what type of rock are the pillow and sheet lava flows - correct answer -basalt Where is the Moho - correct answer -between the layered gabbros and layered peridotite When a magic magma crystallizes to form a gabbro, which of the following minerals would be the last to crystallize - correct answer -plagioclase feldspar When a granite weathers, which of the following minerals is the first to weather away - correct answer -biotite