41. The roots of the trees and plants hold together soil particles , preventing them from being washed away. 42. However, soil particles strongly adsorb fenthion that makes it less susceptible to percolate with water through the soil. 43. They also measured electrical and thermal conductivity of soil particles using a probe on the robotic arm scoop. 44. If it remains in a ball, it's high in clay; this means the soil particles are tightly clustered. 45. Soil particles first develop from direct rock decomposition by lichens and typically collect in crevices in lava flows.46. The caesium is broken away from soil particles and then precipitated with ferric ferricyanide ( Prussian blue ). 47. DNA will be extracted from soil particles , or microbes will be concentrated using a series of filtration techniques. 48. Rain splash occurs when a raindrop impacts the bare soil surface and disperses soil particles to the surrounding area. 49. The opposite charges cause the nutrients to adhere to soil particles which can then be taken up by plants. 50. Soil particles bound to roots are difficult to remove without injury to the roots that then allows microbial attack.