What is it called when an object is being partially or tottally blocked by another object in space

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Why is carbon ideal for making different compounds?

Which element would mostly likely have an electron affinity measuring closest to zero