Answer the following question given this paragraph: Climate change in Earth history was due to natural processes. Recent global warming is due mainly to human actions. The burning of fossil fuels releases greenhouse gases into the air. This creates greater greenhouse effect and global warming. Q: While climate change in earth history was due to natural processes, what is primarily to blame for recent global warming? Choices: - wars - volcanos - factories - human actions A:
human actions

Answer the following question given this paragraph: Ionic bonds tend to form between atoms for which the electronegativity differences are 2.0 and above. In general, ionic bonds between two atoms require one metal and one nonmetal. Q: Ionic bonds between two atoms require one metal and one what? Choices: - liquid - gas - metallic - nonmetal A:
nonmetal

Answer the following question given this paragraph: Molds and casts are another way organisms can be fossilized. A mold is an imprint of an organism left in rock. The organism's remains break down completely. Rock that fills in the mold resembles the original remains. The fossil that forms in the mold is called a cast ( Figure below ). Molds and casts usually form in sedimentary rock. With compression ( Figure below ), an organism's remains are put under great pressure inside rock layers. This leaves behind a dark stain in the rock. Q: Molds and casts usually form in which type of rock? Choices: - igneous - metamorphic - crystalline - sedimentary A:
sedimentary

Answer the following question given this paragraph: The water molecule, like the ammonia and methane molecules, has a tetrahedral domain geometry. In the water molecule, two of the electron pairs are lone pairs rather than bonding pairs. The molecular geometry of the water molecule is referred to as bent . The H-O-H bond angle is 104.5, which is smaller than the bond angle in NH 3 . Q: In the water molecule, two of the electron pairs are lone pairs rather than what? Choices: - bonding ions - acid pairs - ions pairs - bonding pairs A:
bonding pairs