Metals are extracted from their ores.
many copper ores contain only 2% of copper compounds.
copper is now extracted from ores containing a low percentage of copper compounds.
suggest two reasons why.

Which describes interactions between substances and stomata during photosynthesis? check all that apply. oxygen enters stomata. oxygen is released through stomata. carbon dioxide enters stomata. carbon dioxide is released through stomata. hydrogen enters stomata. hydrogen is released through stomata.

The image shows a process that releases nuclear energy which statement best identifies the process shown the process must be fusion because energy is released the process must be fusion because of have your nucleus formed a smaller nuclei the process must be fission because a large nucleus breaks into smaller nuclei the process must be fission because neutrons are formed

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?