What holds sand togehter against wind erosion?

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

What is a possible result of higher air temperature caused by global warming

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system