In order for a layer of rock to be considered a formation useable for relative dating, it must spread across a relatively large area that can be depicted on geologic map. Why is this important?

Matches the chemical name of each oxide of phosphorus to its chemical formula

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.