A distinct layer within a soil profile is called a soil horizon.
Answer:
C?
Explanation:
My best guess would be C as it's the only answer that gives a reason behind the statement.
It's when each of the seven BIOMES occur
Answer:
Sin(60°)=
Explanation:
Assuming the given angles are in degrees
We know that Sin(A-B)=SinACosB-CosASinB
Here A=100° and B=40°

Answer:
The bystander will hear a frequency of 931.18 Hz.
Explanation:
let V = 39.5 m/s be velocity of the police car and Fs be the frequency a siren of the police car emits. let v = 0 m/s be the velocity of the bystander and Vs = 340 m/s is the velocity of sound in air.
then, we know that the bystander has to hear a higher frequency than the one emitted and the frequency that the bystander hears is given by the doppler relation:
Fo = [(Vs)/(Vs - V)]×Fs
= [(Vs)/(Vs - V)]×Fs
= [(340)/(340 - 39.5)]×(823)
= 931.18 Hz
Therefore, the bystander will hear a frequency of 931.18 Hz.