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The use of chlorofluorocarbons (CFCs), found in aerosols and refrigerants, has been one of the main contributors to ozone depletion. When ultraviolet radiation is absorbed by ozone molecules, it creates free radicals which bond with molecules from CFCs, so the ozone is not reformed. Depletion of ozone results in more ultraviolet radiation reaching the Earth's surface.

1) Alfred Wegener saw how the continents looked like puzzle pieces and he put them together. 
2) He saw that habitats from different continents of the same species were across oceans so they must of swam or there was continental drift. 
3) There were tectonic plates proving that the continents are active and moving.

El Niño/La Niña/Southern Oscillation, or just known as ENSO, is the major ocean-current climate change event that happens every few years. This mainly revolves around a big pool of warm water in the Pacific that's typically pushed westwards to SE Asia by the trade winds; the warm water will provide latent heat that drives low pressure and heavy rains for the tropics in SE Asia. The movement of warm water to the west means that cold waters are more present on the eastern edge of the Pacific (CA and South America), which causes nutrient upwelling and provides for lots of fish. But when these winds weaken and the low pressure in SE Asia drops, the water drifts to the East towards South America. The fish will disappear in the warmer water and the eastern tropical Pacific cools down. ENSO cycles also bring in rain on the eastern Pacific side which cause storms and cause drought on the western Pacific, and La Niña years are opposite. In general, expected weather patterns are reversed. ENSO cycles will also then lead to crop failures and large numbers of storms.

Lithogenous sediments are derived from pre-existing rocks. Biogenous sediments form from the remains of organisms. Hydrogenous sediments precipitate directly from seawater. Cosmogenous sediments originate from space.