You can visit Paektu Mountain, Mansudae Hill Grand Monument and lot more.
Rip currents are mainly caused when the sea is rough and large waves break into the shore. the water from the previous large wave tries to find a weak spot in the incoming wave and when it finds it, the water quickly pulls away from the shore causing dangerous rip currents. This type of currents have caused numerous deaths.
The energy is generated by the semi-molten core of the earth which drives the convection currents in the mantle and which causes the plates to move in plate tectonics. James Hutton was the first geologist to intepret that the plutonic rocks on surface like granite were once molten.
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In Chicago, this building was renamed to the "Willis Tower" They planned on reintroducing this building to the world.