Answer: Scientists estimate that the Earth contains 7.5 sextillion sand grains.
Estimating the exact number of grains of sand on Earth is an exceedingly challenging task due to the vastness and complexity of sand formations. Earth has a diverse range of environments including deserts, beaches, and dunes, each containing varying quantities and sizes of sand grains. According to the latest studies, the earth contains sand grains ranging from 7.5 sextillions (75 followed by 17 zeros) to 21 sextillions. These estimates rely on assumptions about average sand grain size, sand depth in different areas, and total sand-covered area.
Ultimately, the immense magnitude and diversity of Earth’s landscapes, along with the countless grains of sand they contain, make it practically impossible to arrive at a precise figure for the total number of sand grains on our planet.