How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it? a. by measuring how fast sea-floor spreading occurs
b. by observing eruptions of molten material on the seafloor
c. by determining the age of rock samples obtained by drilling on the seafloor
d. by mapping rocks on the seafloor using sonar

C Hopes this Helps:)

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.