Determine the formula of an ionic compound formed between two given ions: magnesium oxide, sodium phosphate, and iron (II) nitrate.

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Much of the general structure and physical properties of the interior of the earth are inferred from: a)deep oil and gas bore holes b)geologic investigations c)analysis of seismic waves d) study of volcanoes

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call