How does gravitational lensing tell us about the mass of a galaxy cluster?

In physics the desire of an object to keep doing what it is doing is termed?

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

Which of these statements best explains how the hydrosphere interacts with the atmosphere to affect global climate? mountains block rain clouds and cause changes in global rainfall and evaporation. humans burn fossil fuels to produce greenhouse gases which cause global warming. humans cut down trees which affects the amount of oxygen in different parts of the globe. greenhouse gases, like carbon dioxide, dissolve in oceans and prevent global warming.