What's a stalactite?

a. large mound of dirt created by erosion b. poisonous mass found in caves that is formed by polluted water c. dripstone produced by a buildup of minerals precipitated from groundwater d. mound-shaped stone shaped by weathering

Tall, cone-shaped mountains in which layers of lava alternate with layers of ash are called a. shield volcanoes. b. cinder cone volcanoes. c. composite volcanoes. d. lava plateaus. select the best answer from the choices provided a b c d i need asap

In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a ) moss sporophyteb) moss gametophyte bearing both male and female gametangiac) fern sporophyted) fern gametophyte bearing only antheridia

What percentage of light hits earth's surface directly?