What percent of the earth's surface does the ocean cover? a) 21%
b) 50%
c) 75%
d) 78%

Based on what you know about the location of the earth in relation to the sun, why is this called the goldilocks zone in other galaxies?

Match the letters with the correct terms

Which statement about portugal is not true? a. it granted independence to its last colony in 1975 b. it has avoided conflict with spain c. it was a leader in european world exploration in the 1400s d. its economy is changing from agricultural to industrial b. it has avoided conflict with spain