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Posts Tagged ‘Sand’

Seeing Sands From Different Seas

This particular sand viewed through a microscope is from Maine. As observed, its got different colors throughout every fragment, browns, greens, whites, blues, mostly dark colors though. This sand was not magnetic, and has a size of about 1 millimeter. Our class determined that the sand can be classified as angular, moderately sorted, and composed of different rocks and possible debris.

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purple sand

A lot of people wonder why the sand at Plum island is purple. When we went on the field trip that was the first thing i was thinking about. The sand contains Garnet grains which is what makes the sand purple. The name “garnet” comes from the word, “granatum,” which means “a pomegranite,” for the mineral’s resemblance to the red seeds of the pomegranite fruit. Garnet sand can be any colors from pink to red to even light orange. The garnet sand is only located in three places, Plum Island beach sands, Woodruff Pond sand in the Adirondack Mountains, and Woodruff pond.

Quartz, which is a mineral composed of silicon, is similar to Garnet sand and also causes sand to be purple. Quartz is a variety of clear colors, including white, rose, and purple. Quartz is known as one of the most common components and is a major reason why the sand is purple. Quartz is not in the sand at Plum Island but it is a another component other than Garnet, which is at Plumb Island, that causes sand to be purple.

Theres really only one reason that the sand is purple and that reason is that it contains Garnet grain in it which is not very common. This makes the sand purple because it is a pomegranet color causing the sand at Plum Island to be purple. The sand is very pretty and many think its really odd that its purple but it just contains a certain mineral that others dont.

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Sand Erosions

In Oceanography class, we are learning a lot about the ocean and beaches. Also we have looked at many different types of sand. On beaches, something called erosion occurs a lot. Erosion is the wearing away of rocks and other deposits on the earth’s surface by the action of natural weatherings.  Erosion is created by the cause of water, wind, ice, and waves. These causes wear away the surface of the earth. At local beaches, such as Plum Island, dunes are eroded all of the time. The matter of erosion allows beaches to have new sand each time it erodes.

The main causes of erosions at the beach are wind and waves. Waves are very powerful and can hold up to 2000 pounds of pressure. This creates the ground to be pushed, releasing the sand from the dunes and causing erosion. When combining the pure energy of waves with the chemical of water, it easily breaks down rock. When the sand is moved from the strong waves, new sand is almost always brought back from new waves.

Wind erosions are mostly responsible for the creation of sand dunes. Wind picks up sands and drags it along the beach. Some of the sand sticks to the ground of the coastline created with water and creates a hard and sturdy sand dune. When the wind is strong during a storm or windy day, it may pick up the sand from the dunes allowing dunes to change in shape and size very often. Not only are dunes on the outside of the ocean, but many appear on deserts and upon the ocean floor.

 

  

 

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Sand is always moving. The beaches you might visit everyday are not perminent features. The shape and size of beaches change everyday on a small scale and somtimes drastically over a longer period of time. The changes occur becasue of various reasons but its always because of the sand moving.

In our Oceanography class we looked at different sand samples from around the United States under microscopes and noticed the many differences. Some of the differences are visable to the naked eye and some require the use of a microscope. Here is the list of traits we observed:

  • Color
  • Magnetite
  • Size
  • Texture
  • Wentworth Scale
  • Sorting
  • Composition

A few days after doing our observations we went on a field trip to our local beach. We looked at the sand closely but it did not look any different than the sand we were used to. Although the sand varys greatly around the world, it usually doesnt look very different when the beaches are close to each other. The drastic changes can only seen if one compares sand from different areas across the world. Here is a few examples of the diversity found in beach sand colors.

http://en.wikipedia.org/wiki/Santa_Rosa_Island,_California

http://www.letsgo-hawaii.com/beaches/punaluu.html

source:

http://www.soest.hawaii.edu/GG/ASK/beacherosion.html

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Sand Descriptions

In our oceanography class one day we did a lab that envolved walking around the class and looking at sand. We would go to a station and look through the microscope and draw what we saw. Each different type of sand looked completely different.There are many different types of sand around the world. When people think of sand they thinkof soft and tan, but if you look at it up very close it isn’t just that. There are many different descriptions of sand. All over the world sand looks different. For example during class we walked around the room and looked at sand from different locations underneath a microscope. In Hawaii sand looks very different from places around here. The description of sand there is black sand. It is from the erosion of of volcanic rocks. Black Sand of Punalu’u Beach. In the bahamas sand is very different . It is made up of coral. Parrot fishes eat the coral sand. The term “coral” means limestone. Coral sand can have damaging environmental effects. In Niles Beach the sand looks like crystals. The colors are black, yellow and white. You would be surprised at how different sand really looks up close. By doing this lab i have learned many new things. One thing I have learned that sand isnt just soft and tan but if you look at it up close it has many different colors and textures. It varries in shapes and some pieces of sand are smooth and some are hard. Doing this lab was really interesting. jessica b

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Plum Island Adventures

Plum Island Adventures

On our field trip we went to Plum Island, and we saw certain glacial rocks that had been left behind near our school.  One of the glacial rocks that we saw is called Stickney’s boulder in Groveland MA. Then in Haverhill MA we visited this area where we saw certain rocks that have been left behind from centuries before.  Also in Haverhill MA we saw a rock that had striations which was from the glacier moving from north to south over the rock.

After we visited these certain rock areas we went to Plum Island where we studied the dunes and saw different effects that the ocean has on the beach.  We saw how the dunes were somewhat hilly showing how the wind blows the sand and forms new land masses.  Also from the dunes to the beach there was a sort of shelf that had different layers of sediment shown in it.  You could see the different colors in the sand and you could also see how there were different rocks shoved into the sand.  Also throughout the beach you could see there were darker areas in the sand showing where the high tide goes up to and how low the low tide is.

After looking at the different aspects of the beach we learned a lot about how the ocean affects the land.  You can see how the water can do major damage on some land but also see how different animals and plants need the ocean to survive.  We saw many birds that were taking things out of the ocean and we saw sea weed that had washed up on shore.  Some of the sea weed had holes in it showing that maybe an animal had eaten it.  Also on the shore there were different colors of sand, like purple and it is probably purple from the way the ocean brought it up from the ocean floor or maybe it is darker because of how the sun hits it.  We learned that there were many aspects of the ocean and not just sand and water.

http://www.google.com/imgres?q=plum+Island+dunes+MA&hl=en&safe=active&biw=1280&bih=603&tbm=isch&tbnid=L3dJem5uWdNQsM:&imgrefurl=http://en.wikipedia.org/wiki/File:Sand_Dunes,_Plum_Island,_MA.jpg&docid=G6yzWXxBUrqHDM&imgurl=http://upload.wikimedia.org/wikipedia/en/d/d5/Sand_Dunes,_Plum_Island,_MA.jpg&w=628

Links:

http://detcherphotography.wordpress.com/2011/01/02/day-2-january-2-plum-island-and-purple-sand/

http://www.pbase.com/ne_wildlife_photography/plum_island

http://travellogs.us/Miscellaneous/Geology/Glacial%20erratics/Glacial%20Erratic.htm

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Sand Under a Microscope

Sand may just look like a bunch of little brown particles on the beach, but have you ever looked at it under a microscope? Sand looks a lot different under a microscope. It is actually very cool. Every single particle is magnified. You can see detail on each grain of sand. Not all sands look alike under a microscope. Some sand is jagged others you can see is smooth. Plumb island sand looks round under a microscope. Sand has little detail that you can’t see with a naked eye, but when put under a microscope you can see all of the detail. Some sand shows lines on it, they can have patterns. Sand has many colors, not just the color brown. Some colors sand may have is green, purple, ect. Looking at sand under a microscope is a very interesting activity.

There are a lot of different microscopes that you can use to look at sand under a microscope. Some people recommend having the microscope stereo zoom with magnifications of 10X to 40X. You could also get the dual power 10X / 30X or 20X / 40X stereo. But if you only have a compound microscope then it is suggested that you use the 4X objective only. Using these types of microscope will give you the best result when looking at sand under a microscope.

You can collect sand from any beach and look at it under a microscope. It is like seeing an unknown world that you would not think of looking at before. It can be very fascinating.

http://theuniblog.evilspacerobot.com/?p=6557
See full size image                                               http://throughthesandglass.typepad.com/.a/6a01053614d678970c014e86b9c083970d-600wi

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