What is the difference between melting and freezing?

Y=‐1x + 7 if y has a value of ‐24 what is the value of x?

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?