Assertion: physical sunblock | /r/HasProperty | powered by titanium dioxide
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Source sentences:
text: As for mineral (aka physical) sunblocks, which are powered by the minerals zinc oxide and titanium dioxide and sit on top of your skin to deflect UV rays, look for key words like "non-nano" or "reef friendly" on the label, which means the particles aren't small enough to be absorbed by, and harm, marine life.