The oceans contains enough salt to cover all the continents to a depth of nearly 500 feets

The oceans contain approximately 4.8×10^16 kg of salt, with a density of about 2.16 g/cm³. This equals roughly 2.2×10^16 cm³ or 7.8×10^14 cubic feet of salt. Spread over Earth's land area (~148 million km² or 1.59×10^15 ft²), this would create a layer less than 0.5 feet deep, nowhere near 500 feet. The claim exaggerates by a factor of over 1000.