How does data demonstrate the meaning of half-life

Which number shows the location of the united kingdom of great britain? 7 5 2 4

How does the parallax of a nearby object compare to that of an object farther away?

Computer models can scientists predict weather. some computer models can show the predicted path of hurricanes. what other events could a computer model warn us of? a) undersea earthquakes , tornadoes, and avalanches b) tornadoes c) avalanches d) undersea earthquakes