sábado, 31 de agosto de 2013
viernes, 2 de agosto de 2013
Rocks
Basalt
What is a basalt rock?
Basalt is an extructive igneous rock that is very dark in color. It is the most common type of rock in the Earth´s crust and it makes up most of the ocean floor.
Type of rock
Basalt is an Igneous rock , the main characteristic of igneous rock´s are :
-they are formed by solidification of molten rock ( lava or magma )
- will have intergrown crystals
- minerals solidified or fused together.
It´s modern use
Basalt is used in construction (e.g. as building blocks or in the groundwork), making cobblestones(from columnar basalt) and in making statues. Heating and extruding basalt yields stone wool an excellent thermalinsulator.
How it´s formed?
Basalt forms when lava reaches the Earth´s surface at a volvano or mid ocean ridge. The lava is between 1100 to 1250º C when it gets to the surface. It cools quickly, within a few days or a couple weeks,forming solid rock.
Location of Basalt rock
Most of the basalt found on Earth was produced in just three rock-forming environments: 1)oceanic divergent boundaries 2) oceanic hotspots and 3) mantle plumes and hotspots beneath contrients. The images below feature some of these basalt-forming environments.
Distinguished features:
They are completely crystallized, but with very small crystals, generally invisible to the naked eye, black or very dark gray in color, sometimes contains gas bubbles (as shown in image above).
is a carbonate sedimentary rock containing more than 50% by weight of the mineral dolomite .
It´s modern use
Dolomite is used as an ornamental stone, a concrete aggregate, a source of magnesium oxide and in the Pidgeon process for the production of magnesium .Dolomite is also used as the substrate in marine (saltwater) aquariums to help buffer changes in pH of the water.
How it's formed?
They are Sedimentary rock´s this means that they were formed by sediments.
Conglomerate
¿What is a Conglomerate rock?
Conglomerate is a rock that has pieces of other rocks glued together to form one larger chunk. It is a sedimentary rock that can be found along beaches, rivers, and glaciers where water or ice drops them off. This rock is a kind of calcific sedimentary rock that has various pieces of the different other rocks glued together.
It´s modern use
t is sometimes used as a decoration. A chunk might be polished and sit in a mall or office building. It might be used as an inside wall of a building. It is not very strong and doesn’t have a lot of uses other than decoration. Conglomerate is pretty and can have lots of colors.
where it is formed?
They look so different because they were formed in different places and were made up of different kinds of small rocks, sand, and minerals.
What is a basalt rock?
Basalt is an extructive igneous rock that is very dark in color. It is the most common type of rock in the Earth´s crust and it makes up most of the ocean floor.
Type of rock
Basalt is an Igneous rock , the main characteristic of igneous rock´s are :
-they are formed by solidification of molten rock ( lava or magma )
- will have intergrown crystals
- minerals solidified or fused together.
It´s modern use
Basalt is used in construction (e.g. as building blocks or in the groundwork), making cobblestones(from columnar basalt) and in making statues. Heating and extruding basalt yields stone wool an excellent thermalinsulator.
How it´s formed?
Basalt forms when lava reaches the Earth´s surface at a volvano or mid ocean ridge. The lava is between 1100 to 1250º C when it gets to the surface. It cools quickly, within a few days or a couple weeks,forming solid rock.
Location of Basalt rock
Most of the basalt found on Earth was produced in just three rock-forming environments: 1)oceanic divergent boundaries 2) oceanic hotspots and 3) mantle plumes and hotspots beneath contrients. The images below feature some of these basalt-forming environments.
Distinguished features:
They are completely crystallized, but with very small crystals, generally invisible to the naked eye, black or very dark gray in color, sometimes contains gas bubbles (as shown in image above).
Dolomite
What is a dolomite rock ?is a carbonate sedimentary rock containing more than 50% by weight of the mineral dolomite .
It´s modern use
Dolomite is used as an ornamental stone, a concrete aggregate, a source of magnesium oxide and in the Pidgeon process for the production of magnesium .Dolomite is also used as the substrate in marine (saltwater) aquariums to help buffer changes in pH of the water.
How it's formed?
They are Sedimentary rock´s this means that they were formed by sediments.
Conglomerate
¿What is a Conglomerate rock?
Conglomerate is a rock that has pieces of other rocks glued together to form one larger chunk. It is a sedimentary rock that can be found along beaches, rivers, and glaciers where water or ice drops them off. This rock is a kind of calcific sedimentary rock that has various pieces of the different other rocks glued together.
It´s modern use
t is sometimes used as a decoration. A chunk might be polished and sit in a mall or office building. It might be used as an inside wall of a building. It is not very strong and doesn’t have a lot of uses other than decoration. Conglomerate is pretty and can have lots of colors.
where it is formed?
They look so different because they were formed in different places and were made up of different kinds of small rocks, sand, and minerals.
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