working sunscreen
when the colour persists/ stays for a longer period of time before going colourless again
It stays fresher for a longer time.
It stays light longer in the north of the US than in the south of the US because the north of the country faces the sun for a longer period of time.
Not that you could measure. A fan should reach a stable speed in just a few seconds.
You can buy sunscreen at any drugstore like Walgreens or CVS. Walmart, Target, grocery stores and supermarkets also carry sunscreen. The best suncreen you can buy, in my opinion, is sports sunscreen because it is waterproof, sweat resistant, and longer lasting than regular sunscreen. Also, always make sure to get SPF 30 or higher for better protection.
Not all sunscreens are the same, and it is generally the SPF rating that makes one sunscreen better than another. The greater the rating, the longer you are protected for
A longer pendulum has a longer period. A more massive pendulum has a longer period.
If the river is calm and the woman stays hydrated and reapplies sunscreen often. It should be absolutely fine.
iron or steel
It is climate
UV stands for Ultra Violet, and UV light is harmful to your skin if your skin is exposed for long enough. Sunscreen tends to block, absorb, or reflect UV rays, therefore protecting your skin. The strength of the sunscreen can differ, and that's why you see labels on sunscreen bottles saying "25 SPF" or "35 SPF", the higher numbers indicating stronger sunscreen for longer or more intense exposures.
A longer pendulum has a longer period.