Munsell Soil Color Chart |
BearRocks
Sunday, April 22, 2012
Community Gardens and Soils
The Macon Roots organization which promotes
community gardening in Macon,the Beall's
Hill Neighborhood Association, and Centenary Church have a wonderfully productive garden located in the green space behind Centenary
Church on Ash Street. Its twelve raised beds are communal. There are no individual plots and the harvest is
shared. The folks who volunteer reap a harvest of fresh vegetables and sense of purposeful community.
The Munsell Soil Color Chart helps gardeners determine the type of soil in their garden.
Igneous Rocks
Granite |
Pumice |
Obsidian |
Obsidian is an igneous rock that forms when lava cools quickly above ground. It is glass-like and the edges are very sharp.
Basalt |
Saturday, February 11, 2012
Common Minerals and Rocks
Olivine |
Hornblende |
Feldspar |
Quartz |
Types of Maps
There are many types of maps. they all require marginal data and possibly a legend to maximize their usefulness. Below are some common types of maps. | |
Isarithmic maps, also called contour maps, identify areas of smooth, continuous, univariant data and show the separation of such areas using isobars. This one gives North Carolina's temperature on a given day. |
Chlorpleth maps show aggregate statistical data for predefined areas such as counties or states by coloring or shading these regions. |
Proportional symbol maps use a single symbol for a predefined area. The symbol is sized proportionate to the quantity of the variable being measure. This one illustrates wine consumption in Europe. |
Prepared maps identify features of interest on a given landscape. This one shows snowmobile trails in the Black Hills of South Dakota. |
The Yellowstone Caldera & Plate Tectonics
Yellowstone is one of the most fascinating geological features on Earth! It is the largest volcanic caldera on the planet. A caldera is a cauldron-like feature created by a collapsed supervolcano. The caldera sits astride a geologic hotspot; an area of the earth's crust where hot, lightweight molten rock rises near the surface. This phenomenon is responsible for "Old Faithful", other geothermal vents (geysers), and for other features like hot, bubbling mud pans.
Yellowstone is actually comprised of three overlapping calderas. Plate tectonics accounts for its enormous size. Over a long period of time, volcanic activity created the first caldera. The hotspot remained in place as the plate with its caldera moved west. The hotspot erupted again and eventually formed another caldera which, in turn, moved west with the plate. The process continues today. The area is monitored constantly because the threat of another supervolcanic event is ever-present. Yellowstone experiences 1000-2000 measurable earthquakes every year.
Yellowstone is actually comprised of three overlapping calderas. Plate tectonics accounts for its enormous size. Over a long period of time, volcanic activity created the first caldera. The hotspot remained in place as the plate with its caldera moved west. The hotspot erupted again and eventually formed another caldera which, in turn, moved west with the plate. The process continues today. The area is monitored constantly because the threat of another supervolcanic event is ever-present. Yellowstone experiences 1000-2000 measurable earthquakes every year.
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