What is a system of millions or billions of stars, together with gas and dust held together, by gravitational attraction?

What is a reasonable action that provides safe water for communities?

Suggest two reasons why irrigation is important for human development of the desert

The specific heat of the three substances in the image are given in the table. stamped concrete: 0.75, grass covered soil: 1.01, water: 4.18. place the areas in order based on how fast they’ll heat up on a sunny afternoon. start with the fastest and end with the slowest.