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it is useful to use the thin tissue in a microscope rather than the thick which you can not see through.
Yes it will be warmer depending on how thick your thick layer is!
Answer: the epidermis of a leaf includes: upper epidermis and lower epidermis but if you are referring to the epidermis of an onion: it is only one layer
chunk
thick layer
it rather depends on how thick a layer you put down.
It is possible, especially if the plastic is a nice thick chunk. If it is a thin layer it may very well be invisible to x-rays but still visible to ultrasound or NMR.
Ozone layer is the thick layer. It protects us from UV rays of the sun.
2000 km thick
mantle is the thick layer before you reach the core of the earth
Yes, a thick layer of ozone covers the entire earth. This layer is called ozone layer and is present in the stratosphere region of atmosphere.
It's about 2900Km thick It is 2,867km thick, which is 1,781 miles thick. The above answer is correct too though, and is probably easier to remember.