It is shaped by a Mediterranean climate (mild, wet winters and hot dry summers) and wildfire, featuring summer-drought-tolerant plants with hard sclerophyllous evergreen leaves, as contrasted with the associated soft-leaved, drought-deciduous, scrub community of coastal sage scrub, found below the chaparral biome.n its natural state, chaparral is characterized by infrequent fires, with intervals ranging between 10â15 years to over a hundred years.
Echo is caused by reflection of the sound from a broad and hard obstacle. The echo can be heard if the following condition is met. To hear a distinct echo, the time interval between original sound and the reflection must be at least 0.1s.
Schumann resonances occur because the space between the surface of the earth and the conductive ionosphere acts as a closed waveguide. This waveguide acts as a resonant cavity for electromagnetic waves. Schumann resonances appear as distinct peaks at extremely low frequencies starting around 7.8 hertz, which is considered the fundamental frequency. Schumann resonances in Earth-ionosphere cavity. Courtesy NASA. Resonances can be observed at around 7.8, 14, 20, 26, 33, 39 and 45 hertz, with a daily variation of about Â± 0.5 hertz, which is caused by the daily increase and decrease in the ionization of the ionosphere due to UV radiation from the sun (also see the live data).