Anh chị hãy cho biết nhóm IIA gồm những kim loại nào

What’s the scientific notation for the number 6,840,000,000

Which type of precipitation would most likely form when the surface air temperature is slightly below freezing and the air temperature increases as you move upward away from the ground?

According to the diagram, what sources contribute to the phosphorus found in soil? according to the diagram, phosphorus found in soil contributes phosphorus to what other sources?