What term refers to elements in group 18 that only react with other elements under special laboratory conditions?

Asap! how does the distance between two objects affect the force of gravity? how is the moon dependent on the sun?

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

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?