Which activates a convection current, starting the flow of a fluid? a. cold temperatures at the north pole b. heated liquids at earth's surface c. iron-rich rocks in the mantle d. temperature differences in the mantle

The impact of a large asteroid comet with earth has been proposed to have caused the extinction of the dinosaurs. the impact site of this comet is in or near

Identify, in detail, three environmental effects of agriculture and explain how the actions of farmers cause them. what is the relationship between poverty and obesity in america and why? what are genetically modified organisms? list two pros and two cons for using genetically modified organisms. y'all this is due !

What is the amount of organic matter in all living organisms in a habitat called?