If the spots are under the pool returns and you have a cartridge filter of some sort then there may be a hole in the filter somewhere or a flaw in the seal that holds it in place. If the dirt is sand and you have a sand filter the laterals in the bottom of the sand filter may be starting to wear and need replacing. A more realistic answer would be that your pool has poor circulation and those "dirt spots" are eddys where there is little circulation so any dust, dirt, leaves, bugs etc that are in suspension just drop off there and settle to the bottom. Poorly designed pool hydraulics.
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Freckles are spots of extra pigmentation in the skin.
People treated them as if they were animals or dirt back then
wash your body with soap and water.
Not washing your face enough! You get spots by having oil and dirt on your face which fills up the pores and seals to make a spot. If you wash your face everyday and use creams to clean out your pores you should have less spots but some people get spots anyway and there's nothing you can do. Also you can get acne which is really severe spots that are very sore to touch on your face and sometimes your back.
Because it takes the dirt off of your face. If it's not dirt though, it is probably mold. Dry it out frequently to prevent this.
it is a duck egg
If you plant flowers on the dirt spots that's when it grows back. Running and walking either way still wears down the grass.
Dirt, grime and carbon particles
People could not survive very long on eating dirt.
Cleanse, tone and most importantly moisturize each morning and night Cleansing removes dirt and oil whilst the toner removes dirt left behind from the cleanser. Moisturizer acts like a guard on your face and stops most dirt from getting into your face.
Yes, you could get dirt in them if you don't.
It is the water content (or lack of) that alters the condition of the dirt (soil).