Continuous volcanic eruptions contributed which of the following to the atmosphere of Earth? A. Carbon dioxide
B. methane
C. nitrogen
D. water vapor
E. none of these
F. all of these

What structure on the south african coast has a range of 63 km and releases flashes every 30 seconds?

After considering options, a student using the problem-solving process should next

Since 1980, which three countries have either attacked or been attacked by iraq? a. iran, turkey, united states b. iran, israel, jordan c. iran, kuwait, united states d. iran, saudi arabia, egypt