Morocco United States oldest unbroken friendship treaty

Morocco has America's oldest unbroken friendship treaty

Morocco recognized the fledgling United States as independent in 1777. The two countries signed their Treaty of Friendship in 1786, and it remains the United States’ oldest unbroken friendship treaty.

The seafloor records Earth’s magnetic flips like a barcode

New rock forming on the ocean floor records the direction of Earth’s magnetic field. As the field flips and new seafloor moves outward, matching magnetic stripes form on both sides. These stripes became strong evidence that the seafloor is spreading.

68.7% of Earth’s fresh water

Most fresh water is frozen

Ice caps and glaciers hold about 68.7% of Earth’s fresh water. Roughly 30% is groundwater, while only about 1% is surface water, so most fresh water is not readily available on the surface.

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Morocco United States oldest unbroken friendship treaty

Morocco has America's oldest unbroken friendship treaty

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