Question 1 1. Recall from your reading about the nature of volcanoes to choose the best answer: A volcanic eruption is driven by __________ and __________ which forces its way upward and may ultimately break though zones of weaknesses in the Earth's crust. heat; water pressure heat; gas pressure buoyancy; gas pressure buoyancy; water pressure 2 points Question 2 1. Recall from your reading about the nature of volcanoes to choose the best answer: Which type of basaltic lava flow has a fairly smooth, unfragmented, ropy surface? Aa Pahoehoe Pumice Scoria 2 points Question 3 1. Recall from your reading about the nature of volcanoes to choose the best answer: Magma tends to rise toward Earth's surface principally because __________. of magma cooling mounting pressure within the reservoir rocks become more dense when they melt of convection in the mantle 2 points Question 4 1. Recall from your reading about the principle types of volcanoes to choose the best answer: Crater Lake, a caldera, formed from the collapse of a __________. composite volcano. shield volcano. cinder volcano. lava dome 2 points Question 5 1. Due to the nature of volcanoes the violent separation of gas from lava forms __________. dikes craters cinders pumice 2 points Question 6 1. Recall your reading of Relative Time Scale and Radiometric Time Scale and match the term with the definition. Isotopes Half-life Carbon 14 Igneous rocks Hutton Petrology Index fossil Stratigraphy A. Atoms of the same element with differing atomic weights B. Rocks that generally do not contain fossils C. The Scottish geologist who first proposed the fundamental principle used to classify rocks according to their relative ages D. Forms of life which existed during limited periods of geologic time and thus are used as guides to the age of the rocks in which they are preserved E. Studies on the origins of the various kinds of rocks F. The time it takes for one-half of a particular radioactive isotope in a sample to decay G. Studies of rock layering H. Isotope found in all living plants and animals 8 points Question 7 1. Recall from your reading of Principal Types of Volcanoes, and match the description to the type of volcano. Large, fairly steep-sided cones composed of alternating layers of lava flows and pyroclastic material. Small basaltic cones built during one, short, eruptive episode; dominated by cinders. Volcanoes of southwestern Alaska and the Aleutian Islands. Big volcanoes of Hawaii Volcano Paricutin in Mexico Forms dikes from lava Lava is produced after the eruption and flows from the bottom Volcanoes with gentle slopes spreading over large areas A. Shield volcanoes B. Cinder cones C. Composite/stratovolcanoes 8 points Question 8 1. Recall from your reading about the radiometric time scale to put the following isotopes in order of use, from oldest rock to youngest. Carbon-14 Potassium-40 Samarium ...