Lava is pouring out of the crust at a vent on the ocean floor. As it cools, igneous rocks form. Which characteristics would one
expect to find when studying the cooled lava? a. small crystals and coarse texture b. small crystals and fine texture c. large crystals and coarse texture d. large crystals and fine texture
2 answers:
Answer:
b. small crystals and fine texture
Explanation:
Generally, igneous rocks are formed from the solidification of molten magma . Molten magma are usually semi liquid that originates from the interior of the earth. The location or environment where the magma solidifies determine the kind of igneous rock that is formed. If the magma solidifies below the earth crust it will result to an intrusive igneous rock which have a coarse texture due to the slow rate of solidification. But if magma creeps or erupt to the surface of the earth crust as lava, the solidification process becomes rapid to form an extrusive igneous rock.
Lava pouring out of the crust at a vent or fissure on the ocean floor are more expose to cooler temperature, water and air . This result to rapid cooling and more faster crystallizing process to form more fine grain and small crystals. Example of this extrusive types of igneous rocks is Basalt.
The picture below are examples of extrusive igneous rocks . Notice their small crystal .
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Global climate change is most likely the result of _______. Environmental issues: Select the best answer from the choices provided.
A. Increased carbon dioxide in the air.
B. Diminishing natural resources.
C. Decreased Oxygen and carbon dioxide in the atmosphere.
D. Biodiversity.
Option"A" is correct: Increase in Carbon dioxide in Air.
a.) <u>How</u><u> </u><u>global climate change is related to the increase of carbon dioxide </u><u>in</u><u> </u><u>Air</u><u> </u><u>?</u>
The Increase of Carbon dioxide in Air results in increase of Global warming(Green house effect).
Green house effect : A building mostly made of glass for growing or shelter in the delicate plant is called greenhouse. the glass walls of greenhouse allows sun rays to pass through the interior.However, reflected back infrared rays are not allowed to escape through the glass walls. Carbon dioxide gas and water vapours present inside the glass house further trap the heat and make the greenhouse warmer than the outside air.
The atmosphere cover around the earth ,acts similar to the glass walls of greenhouse. the air cover solar radiation to pass through it to the Earth’s surface, and prevent the long wave infrared radiation to escape into the space.Gases such as Carbondioxide,Nitrogen oxide,CFCs,ozone are the Greenhouse gases and among all of them "Carbon dioxide" is the most important gas.These greenhouse gases trap the heat reflected by the earth.
The heating up of the atmosphere leads to an increase in Earth's temperature.This phenomenon is called " Global warming or Green house effect.
b.) <u>What</u><u> </u><u>are</u><u> </u><u>the</u><u> </u><u>effects of </u><u>G</u><u>lobal warming</u><u>?</u>
Increase in earth temperature will cause a change in weather and precipitation patterns on the earth.
As we know the fact that " An increase of less as 1°C in Earth's temperature can lead to melting of polar ice caps and consequent rise in sea level".The sudden rise of sea level can submerge a number of major cities of the world which are located along the coasts.
Global warming poses a threat of recurrence of "Dust Bowl condition of 1930's".Dust Bowl is an area where vegetation has been lost and soil reduced to dust making it suspectable to erosion.
One of major danger of global warming is " Methane burp"which is caused by the melting of Methane hydrates in permafrost of polar ice caps & on the sea floor.