Consider the navigation challenges faced by Columbus and his crew because certain technology was not available in 1492.Then, make an inference about sea travel after the late 1700s. Support your inference using details from 0:45–1:40 of "BBC Science Club: All About Exploration."

Review president franklin delano roosevelt’s “four freedoms” speech and president barack obama’s “welcoming remarks” speech. is the “freedom from fear” a concern for both men and women equally? compare and contrast both speeches to answer this question. use the “wedding cake” compare contrast organization.