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Across 2. A ______ is anything that can flow and takes the shape of its container; these include both liquids and gases (Fact 186) 3. metals are ______, meaning they can be drawn into a wire (Fact 259) 4. particles in a _______ are loosely connected, are able to slide past each other, and move fast enough to break some of the attractions between them (Fact 220) 7. ______ are large groupings of stars in space that are classified by their shape (Fact 179) 8. there are about _____ _______ known elements (Fact 256) 9. a _____ force is the upward force that fluids exert on all matter; this force acts in opposition to the downward force of gravity (Fact 198) 10. _____ is the most common state of matter in the universe (Fact 225) 13. the mass number of an atom is equal to the sum of its protons and _____ (Fact 251) 14. the _____ _____ of an atom is equal to the number of protons in its nucleus (Fact 250) 17. each proton has a mass of ____ amu, each neutron has a mass of 1 amu and each electron is given a mass of 0 amu (Fact 248) 19. metals are malleable meaning they can be pounded into thin sheets (Fact 259) 22. _____ _____ is the largest mountain in the solar system and is found on Mars (Fact 150) 24. the formula for _____ is mass divided by volume (Fact 183) 25. a _____ force causes objects to move in a circle (Fact 119) 26. _____ is the speed and direction of a moving object (Fact 80) 27. most _______ are solids at room temperature, are good conductors of heat and electricity, are shiny and have high melting points (Fact 258)

Down 1. a light year is a unit of length equal to the distance that light travels in one year; it is a distance of about 9.5 trillion kilometers per year (Fact 136) 3. it took about 100 million years for the _____ _____ to form and it is now about 4.6 billion years old (Fact 131) 5. _______ is the tendency of all objects to resist a change in motion (Fact 123) 6. a ______ is a curve in the surface of a liquid (Fact 59) 9. On Earth, the ______ _______ (temperature at which a liquid changes to a gas) is 100 degree Celsius (Fact 209) 11. _______ is a force that opposes motion between two surfaces (Fact 100) 12. the ___ _____ is a chart that organizes all known elements (Fact 262) 15. ________ are dull, poor conductors of heat and electricity, and are brittle (break easily) Fact 260) 16. elements can be classified as metals, nonmetals or ______ (Fact 257) 18. an _________ is a pure substance that cannot be broken down by physical or chemical means (Fact 254) 20. _______ are called semi conductors and have properties of both metals and nonmetals (Fact 261) 21. Jupiter has a giant ongoing ______ in its atmosphere that is called The Giant Red Spot (Fact 156) 23. particles in a plasma are broken apart, move independently of each other, conduct electric current and are not affected by _______ fields (Fact 224)