Complete the following analogy

scratch test: hardness
a. metallic luster, b. porcelain tile

c cost: diamond purity, d. colored diamond clear diamond

Ineed the definitions of all of these words nasap i will give 1o points to whoever awnsers

Texas has an impending storm, and california is experiencing a water crisis. match the technologies with the state that can use them to reduce the effects eddies natural hazards. texas is the storm cellar and the wood that is crisscrossed. california is the dam and the storage tanks

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion