Which practice fits the definition of conservation?

using more of a mineral resource than needed

not using a necessary mineral resource at all

strip-mining a mineral without regard to the surface soil and vegetation above it

recycling cans that contain a material like aluminum

Ineed with these last two questions: 1) what are two types of cold air masses that influence the weather in north america? name them and describe their humidity. 2) describe the motion of a cold air mass and a warm air mass and the weather you would expect at a warm front and an occluded front.

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s