Which is a type of clouds that creates a uniform, flat gray sky?
A. Cumulonimbus
B. stratus
C. Cumulus
D. Cirrus

Scientists think that convection currents flow in earth’s a. continents. b. mantle. c. lithosphere. d. inner core.

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

Sink holes may eventually for to join a. wide valleys b. zone of aeration c. dripstones d. aquifer