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The diatoms are one of the largest and ecologically most significant groups of organisms on Earth. They are also one of the easiest to recognize, because of their unique cell structure, silicified cell wall and life cycle. They occur almost everywhere that is adequately lit (because most species need light for photosynthesis) and wet - in oceans, lakes and rivers; marshes, fens and bogs; damp moss and rock faces; even on the feathers of some diving birds. Some have been captured by other organisms and live as endosymbionts, e.g. in dinoflagellates and foraminifera. Because of their abundance in marine plankton, especially in nutrient-rich areas of the world's oceans, diatoms probably account for as much as 20% of global photosynthetic fixation of carbon (~ 20 Pg carbon fixed per year: Mann 1999), which is more than all the world's tropical rainforests.
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Can freon displace oxygen in the air?
Yes. All gasses take up space and can therefore displace oxygen.
What is the composition of gases that make up the earths atmosphere?
The Earth's atmosphere is made up almost entirely of two gasses, oxygen & nitrogen. It's 21% oxygen and 78% nitrogen. So, these two make up 99%. The remaining 1% is a collection of other gasses.
What are the dangers of gases in mines?
There are several classes of danger.Suffocation - depletion of oxygen usually caused by build up of heavy CO2Poison - accumulation of poisonous gasses - CO, H2SExplosion - build up of explosive gasses - coal gas or methane.Dust in the mine's air - leading to lung disease and obscuring vision.
Why on Labels on cylinders of compressed gases state the highest temperature to which the cylinder may be exposed give a reason for this warning?
The highest temperature warning is because as gasses heat they expand and take up more space. If a container gets too hot the gasses reach a point where their volume is too much for the container and the metal can not longer retain its shape, thus causing the cylinder to burst (typically very violently).
Is Argon poisonious?
No. Argon is completely nontoxic. However, as with all gasses, argon takes up space and so can displace oxygen.
Gasses will to take up as much room as they can?
yes.
Does gases take up a lot of space?
Gasses spread out to take up as much space as they can but it really depends on the amount of gas.
How long are diatoms?
Diatoms are usually between 2 and 200 microns in diameter, though there has been some up to 2 millimeters in size
Why do centric diatoms live in saltwater and pennate diatoms live in freshwater?
look up bacillarophyta on wiki. these were some of the first organisms to live on earth.
Why do gasses take up so much space?
because they need room for the particles to move around
Which type of sediment is made up mainly of the shells of diatoms?
Siliceous
Can freon displace oxygen in the air?
Yes. All gasses take up space and can therefore displace oxygen.
What substance makes up the greatest percentage of the shells of diatoms?
Silica -IAmReallyRone
Which type of sediments is made up mainly of shells of diatoms and radiolarians?
Siliceous
Why are ground-up diatoms sometimes added to powdered cleansers?
the ground-up diatoms are added to cleansers because they are hard and don't scratch any surface.
What are the gasses that make up the greenhouse gasses?
Carbon MonoxideCarbon DioxideNitrogen OxidesSulfur dioxides
It is sometimes said that diatoms live in what kind of house?
All diatoms are enclosed by a frustule that is made up of two valves fitted together by a connective zone called a girdle.
