00:00:13an astronomical fact of life
00:00:16the earth is tilted on its axis 23 and a
00:00:19half degrees as the planet moves in its
00:00:23yearly orbit that angle comes as the
00:00:25position of the northern hemisphere to
00:00:27change relative to the Sun in the winter
00:00:30it’s tilted away from the Sun in the
00:00:35summer it angles towards the center
00:00:37because of the planets tilt during the
00:00:40summer sunlight hits the earth at a more
00:00:42direct angle so the warming effect of
00:00:45the sunlight is more intense plus the
00:00:50Sun is at its highest point in the sky
00:00:51so there are more hours of sunlight to
00:00:54provide heat the opposite is true for
00:00:57the southern hemisphere where the
00:00:59seasons are reversed when we’re angled
00:01:01toward the Sun they’re angled away so
00:01:05while our Australian friends chill out
00:01:07in winter we’re headed for the beach
00:01:18there is some amazing science behind how
00:01:20that golden strip of sand is created
00:01:25the sand on most beaches begins not in
00:01:28the ocean but inland over time
00:01:32weathering by ice wind and rain breaks
00:01:35down rock into sediment creeks and
00:01:39rivers wash the sediment downstream
00:01:43once in the ocean currents of water
00:01:45called longshore currents that flow
00:01:47parallel to the coast carry those
00:01:49sentiments along the shoreline waves
00:01:52then push the sand onto Shore forming
00:01:55beaches longshore currents can deliver
00:02:00up to a million cubic yards of sediment
00:02:02to a single Beach each year
00:02:07most waves that deliver sand to our
00:02:09beaches are born thousands of miles away
00:02:15ocean waves are created basically by the
00:02:17wind the wind blows across the surface
00:02:19of the water and it agitates the surface
00:02:22of the water causing a wave to be formed
00:02:24the longer the wind blows or the
00:02:26stronger the wind blows the bigger the
00:02:28wave that’s going to create waves are
00:02:33generated by wind blown across the
00:02:35surface of the ocean energy from the
00:02:39wind is transferred to the wave through
00:02:41friction between the air and water wind
00:02:46that blows faster longer and further
00:02:48will transfer more energy into the ocean
00:02:51and create bigger waves waves sometimes
00:02:55travel across vast expanses of open
00:02:57ocean in some cases as far as 10,000
00:03:01miles waves can travel across entire
00:03:04ocean basins so a very strong storm in
00:03:08the southwest Pacific will create a
00:03:10swell which could go all the way across
00:03:11the Pacific Ocean and end up impacting
00:03:13Mexico or the west coast of North
00:03:16America
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