Need a little with this one question

How are the high islands of the pacific formed? a. by connected coral reefs called atolls b. by lagoons c. by moving glaciers d. by underwater volcanoes

5. how is transported soil different from residual soil? o a. it forms on unconsolidated materials. ob. it develops on bedrock. o c. it has been moved from another location. d. it transports other materials.

The african continent is home of the worlds largest desert and longest river . t or f