Rock (geology) | Art materials
Rock or stone is a natural substance, a solid aggregate of one or more minerals or mineraloids. For example, granite, a common rock, is a combination of the minerals quartz, feldspar and biotite. The Earth’s outer solid layer, the lithosphere, is made of rock,More info:wiki
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#10 Geology Word of the Week: F is for Float,More info:blogs.agu
Loose pieces of rock that are not connected to an outcrop.
If you’re in the field with a geologist, you’re very likely to hear the word “outcrop” and the phrase “in situ“. When describing, identifying, mapping, and understanding rocks, geologists like to see rocks in context. If rocks were alive, you might say that geologists like to observe rocks in their natural habitats. You might say that geologists like to observe where rocks live and who their neighbors are and how they interact with their neighbors. Of course, rocks aren’t alive, but geologists still find it very useful to observe rocks in situ, a Latin phrase that literally means “in position.” When rock is observed in situ, that means that it is attached to an outcrop, which is a place where bedrock or other “in position” rock is exposed at the Earth’s surface. Sometimes, outcrops are natural– they are places where weathering, erosion, faulting, and other natural processes have exposed hard rock above softer soil, sediment, alluvium, and colluvium. Often, outcrops are manmade. Geologist are found of observing rocks exposed at manmade outcrops such as roadcuts and quarry walls. Observing rocks in situ at outcrops allows geologists to gather much more information about the rocks than can be gleaned from a fragment of rock alone. By observing rocks in context, geologists can gather much information about the structure, stratigraphic position, size, degree of weathering, and many other aspects of a particular body of rock. Observing rocks in situ at an outcrop is particularly important for geological mapping. Only rocks observed at an outcrop can be confidently delineated on a geologic map.
#9 Geologic Age Dating Explained,More info:kidsdiscover
Unlike people, you can’t really guess the age of a rock from looking at it. Yet, you’ve heard the news: Earth is 4.6 billion years old. Dinosaurs disappeared about 65 million years ago. That corn cob found in an ancient Native American fire pit is 1,000 years old.
How do scientists actually know these ages? Geologic age dating—assigning an age to materials—is an entire discipline of its own. In a way this field, called geochronology, is some of the purest detective work earth scientists do.
There are two basic approaches: relative age dating, and absolute age dating. Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you. Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.
#8 What is a mineral?,More info:blogspot
#7 GEOLOGY HIGHLIGHTS,More info:redrockcanyonlv
The Red Rock Canyon National Conservation Area is located just a few miles west of Las Vegas and encompasses 195,819 acres within the Mojave Desert. Red Rock Canyon is an area of worldwide geologic interest.
Many experienced and amateur geologists alike who visit Red Rock are amazed by the rock formations, natural beauty, and the vivid colors of the rocks. The forces of nature that have formed such a visual display have taken millions of years to create the masterpiece that is now known as Red Rock Canyon National Conservation Area. We invite you to explore and view the geological features that make this area unique.
#6 WHAT ARE IGNEOUS, SEDIMENTARY, & METAMORPHIC ROCKS?,More info:utah
#5 Millook Haven Cliffs With Rock Folds,More info:runic
#4 What Makes Metamorphic Rocks So Unique?,More info:thoughtco
Metamorphic rocks are the third great class of rocks. They occur when sedimentary and igneous rocks become changed, or metamorphosed, by conditions underground. The four main agents that metamorphose rocks are heat, pressure, fluids, and strain. These agents can act and interact in an almost infinite variety of ways. As a result, most of the thousands of rare minerals known to science occur in metamorphic rocks.
#3 GEOSIGHTS: FISHER TOWERS – THE TOWERING RED ROCK SCULPTURES OF GRAND COUNTY, UTAH,More info:utah
Fisher Towers, located about 20 miles northeast of Moab in southeastern Utah, is one of the most scenic landscapes along the Colorado River.
Administered by the Bureau of Land Management, Fisher Towers Recreation Site is a popular destination for hikers and rock climbers. A moderate 2.2-mile (one way) hiking trail takes you along the base of the towers and spires to a scenic overlook of Professor Valley and the Colorado River.
Geologic Information:
Fisher Towers contains layers of sedimentary rock in various shades of red-brown, red-purple, and maroon. The colors are a result of varying amounts of hematite (an iron oxide).
The upper, darker part of Fisher Towers consists of the lower sandstone member of the Triassic Moenkopi Formation (approximately 245 million years old).
The middle and lower parts of the towers are sandstone, mudstone, and conglomerate of the Permian Cutler Formation (approximately 290 million years old).
The conglomerate contains sub-rounded to rounded cobbles and pebbles of quartz, feldspar, mica, granite, schist, and quartzite that were eroded from nearby Precambrian (over 1 billion years old) metamorphic and igneous rocks
#2 How to Identify Black Minerals,More info:thoughtco
Pure black minerals are less common than other types of minerals and can sometimes be difficult to recognize if you don’t know what to look for. However, by carefully observing such things as grain, color, and texture and studying their most notable characteristics—including luster and hardness as measured on the Mohs Scale—you should soon be able to identify many of these geological rarities.
#1 An Introduction to Geology,More info:opengeology
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