Earth's magnetic field is generated by

gravitational forces at the poles

exchange of gases at the poles

the movement of electrical charges inside earth

chemical reactions in the van allen radiation belt

Five natural materials in a room

How can pyroclastic clouds and lahars affect the environment?

Number of valence electrons for calcium?

Which possible discovery would be attributed to an inorganic molecule? a protein that contains more energy than lipids a fireproofing spray used in firefighting a new energy-efficient fuel source a synthetic polymer that resists degrading

When the kinetic energy of particles in a substance decreases, what also decreases? The size of the particles in the substance. The number of particles in the substance. The substance's specific heat. The substance's temperature.

Alleles are variations of genes. How are they expressed? A. repetitive or creative B. major or minor C. temporary or permanent D. dominant or recessive

Which statement about electric force is true?

The boundary between the crust and mantle is marked by a seismic-velocity discontinuity called

average distance of 160.0 cm. Its average time was 5.74 seconds. What is its average speed?

Tools used as nut crackers by chimps and birds