Threatening to cover Caribbean islands and Florida beaches in foul-smelling mounds of decomposing brown sludge, a 5,000-mile-long blob of seaweed that weighs an estimated 6.1 million tons is threatening to block the world's oceans.
The millions of different beaches in the world bring many different colors of sand. But why are they different colors? The color of sand mainly depends on the kinds or color of minerals, rocks, or shells...
