Which BEST explains why the Earth has layers? A. The Earth's layers formed because the heaviest materials (like iron and nickel) float on top of the lighter materials that make up the frost.
B. The Earth's layers formed because the heaviest materials (like iron and nickel) sink below the lighter materials that make up the crust.

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

Which element is the least metallic between cadmium, silver, zinc, or iron?

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?