The atria are the ""upper""chambers of the human heart. What are ""lower"" chambers of the human heart called?

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

This comparative chart is an example of one that might be used by scientists and law enforcement personnel for identification purposes. the chart represents a technological advance called