Which of the following is a farming method that reduce the effects of wind erosion? a) planting wind barriers b) planting crops deeper into the ground c) terracing d) terracing

An observer that stands still as the electron moves by him, will observe

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island