Lab-7

Geology Name:_______________________ Volcanoes Lab Report Please record your responses in a color other than black or red . Part 1: Locating and describing volcanoes 1. Using the Crater Lake topographic map , name three sites that you think formed due to volcanic activity. Crater Lake, Wizard Island, and Erta Ale. 2. Locate Wizard Island on your topographic map . How do you think Wizard Island formed? A large volcanic eruption that left a crater and sent volcanic material everywhere and left molten rock and ash to set everywhere around the crater. 3. Using your Geologic map, locate Wizard Island. What kind of rock is the island made of? I would guess andesite due to its relation to volcanic activity and the characteristics. 4. Using your Geologic map , locate Mariam Cone. What kind of rock is it made of? I would say a mixture of basalt and andesite, maybe even obsidian. 5. Which is older: Wizard Island, or Mariam Cone? How do you know? Wizard Island is older, you can tell due the the size of the crater and the massive amounts of layering Wizard Island has over Red Cone. 6. Using your Geologic map, locate Pumice Flat (southern edge of the map). Identify the mountain that erupted and deposited these rocks. (Hint: This formed the rock type labeled "cu-cp"). Cinder Cone. 7. List the locations in order from what formed earliest to what formed last. Crater lake, Wizard Island, and Red Cone. 8. Summarize the relationship between volcanic rocks, volcano types, hazards, and plate tectonic setting (plate boundary) by filling in the table below. Use reliable resources to find this information (lecture notes, textbook, or websites such as USGS Volcano Hazards Program or

Geology Name:_______________________ Volcanoes Lab Report Smithsonian Global Volcanism Program ). Volcano Type Plate Type/Tect onic Settings Magma chemistry (silica content) and characteri stics (viscosity & gas) Eruptive Style Rock Type Hazards Shield Divergent Low (all) Effusive Basalt Lava flow, small eruptions. Composit e/Stratov olcano Convergent High (all) Explosive Andesite Gases, eruptions, ash fall, pyroclastic flow. Cinder Cone Continental Moderate (all) Explosive Basalt/Ande site Ashfall, volcanic rock from eruptions Caldera Convergent High (all) Explosive Rhyolite/Tra chyte Huge eruptions, pyroclastic flow, ashfall Part 2: Estimating crater size 1. Choose one mare basin on the Moon, and create a careful sketch below, accurately showing the size and location of the basin you chose. Mare Nectaris