Can someone explain half lives to me? the term used in and earth science class

What is the name of the ocean current that affects the british isles? how does it influence their climate?

What's erosion? a. the breakdown of rock into smaller pieces b. the removal of weathered products from rock c. a change in rock resulting from exposure to water d. a chemical change in rock that weakens it

Find the equation of the line passing through the point (–1, 5) and perpendicular to the line 3x + y = 4.