Write true if the statement is true. If it is false, change the underlined word or words to make the statement true.
10.Mechanical energy is associated with the forces that hold particles together in an atom’s nucleus.
11. Electricity is a primary source of energy
. 12. Fossil fuels form in an environment with little or no oxygen.
13. Coal is used to generate about half the electricity in the United States.
14. In strip mining, miners dig shafts deep under-ground to reach the fossil fuel deposit.
15. When sulfide in rock surfaces reacts with oxygen and rainwater, acid drainage occurs.

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.