Which of the following solutions is a good buffer system? a solution that is 0.10 m hcn and 0.10 m nacla solution that is 0.10 m hcn and 0.10 m licna solution that is 0.10 m hno3 and 0.10 m kno3a solution that is 0.10 m naoh and 0.10 m hno3a solution that is 0.10 m nacl and 0.10 m hcl

This active feature of earth's crust in building mountain ranges as well as islands. this feature is a a) cavern. b) earthquake. c) mountain. d) volcano.

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

1. explain hydrogen peroxide, h 2 o 2 properties and decomposition reaction. 2. describe how each of the following natural cycles plays a part in earth’s climate system. (a) the water cycle (b) the carbon cycle