Which of the following is a web app?

Floating freely on the flight deck, sally ride communicates with ground controllers in houston during her sts-7 mission in june 1983. sally ride became the first american woman to go into space when she flew on the space shuttle challenger on june 18, 1983

The steeply sloping region of a continental margin where the sea floor descends at a rate of greater than 1 ft for every 40 feet is called. continental slope. 

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