Answer:The frequency of the echo is slightly decreased
Explanation:
Given
speed of boat ![=30\ mph](https://tex.z-dn.net/?f=%3D30%5C%20mph)
cliff is
away
when boat is still , suppose t is the time taken by the echo to reach observer on the boat
But as soon as boat starts moving the distance between cliff and boat decreasing and time for echo to reach observer also decreases
and we know ![time \propto \frac{1}{frequency}](https://tex.z-dn.net/?f=time%20%5Cpropto%20%5Cfrac%7B1%7D%7Bfrequency%7D)
therefore frequency of the echo slightly decreased.
The correct answers are:
B. plant growth;
C. animal actions;
The mechanical weathering is a type of weathering where physical force is included into the breaking up of the rocks. The plants and the animals are both causing this type of weathering with their actions. The plants can cause mechanical weathering with their roots, as they grow and surround a rock, they are able to create such a pressure that they can break the rock apart. Also, as their trunks are getting bigger, if there's rocks right next to them, the pressure from the growing of the trunk will crack the rocks. The animals are able to move the rocks, as well as pushing them, or even deliberately throwing them, so they manage to break up parts of them and cause mechanical weathering.
I want to say that the answer is either A or B but im not too sure. Im leaning more towards A tho
We will put the number of trips in the first column, the miles driven in the second column and gallons of fuel used in the third column.
8 7,680 1,010
7 9,940 1,330
12 14,640 1,790
12 13,920 2,050