Lab 6 -Volcanoes- In class Lab

Name: ------------------------------------------------- Date:---------------- Lab 6 - Volcanoes In-class lab exercises Part I- Interpretation of Crater Lake – Topographic Map (provided in the lab) The topographic map of Crater Lake National Park depicts a landscape shaped by volcanic activity. 1. What is the scale of the map expressed as a ratio? 2. How many inches represent 1 mile on the map? 3. What is the contour interval of the map? 4. Do the rivers on the map flow towards the lake or away from it? 5. Is this that you would expect, given the location of Crater Lake? Why? 6. What is the surface area of Crater Lake in square miles? Show your calculation. (It is approximately a circle, and the area of a circle is r π 2 ) 1 Jessica Hart 10116 1 . 62500 · inch 50 feet Away from the lake Yes Because around the lathe is lower elevation and that results in downstream waterflow . scale = Mr2 (in = 1 mi - 3 . 14(32) : 81 Diamet ⊥ mi ies p r = 3 mi

Part II- Google Earth – Crater Lake, Klamath County, OR Open Google Earth on your computer. Search for “Crater Lake, Klamath County, OR” in the box at the top left of your screen. Scroll around using the tools at the top right of your screen, until you see a good 3-dimensional view of the mountain and the lake. Use the information below and construct a vertical profile between point 1 and point 2. Latitude Longitude Point 1 42°55'48.00"N 122°12'10.00"W Point 2 42°58'38.00"N 121°59'10.00"W Looking at the shape of your profile and the shape of the mountain on Google Earth, describe the shape of the crater. Where are the steep and shallow slopes on both side of the crater? 1. What geologic feature is Crater Lake? 2. What geologic feature is Wizard Island? 3. What type of volcano is this? 4. What type of magma would you expect to be present here? Why? 5. At what type of plate boundary would this type of volcano form? 6. How does magma form at this type of plate boundary? 2 volcanic lake Cinder con e Explosive udcano A ndesitic Diversent plate boundaries High temperature , Very low on silica and low gas content