00:01
Okay, guys, so we're talking about how green plants affect abiotic environments in ways that help humans.
00:06
So first, let's define a biotic environment.
00:09
So that is going to involve any part of the environment that is non -living.
00:13
So non -living aspects of the environment.
00:18
So how can plants, let's think about trees and green plants, help the abiotic environment in ways to benefit us? so the first way is plants, build and hold soil.
00:33
So you might be asking how plants can build soil and what that means.
00:40
And basically when plants have matter such as leaves falling off of them into the soil, you get worms.
00:47
So let's get some worms on here in this drawing, eating some leaves.
00:52
All right.
00:54
So you have worms and fungi bacteria eating these leaves.
00:58
And these are decomposers.
00:59
And they add organic matter to the soil.
01:03
Which ends up building the soil up.
01:06
Now, so that explains how plants build soil.
01:08
How do they hold soil? now, plants have these extensive root systems.
01:12
All right, so you can imagine a plant's root system coming off it.
01:16
And these, when you have a ton of plants, are going to hold the soil in place and hold the nutrients in place, meaning wind and water will no longer wash the soil away.
01:25
So when you remove these plants, soil is much more likely to erode and the nutrients are much more likely to erode as well.
01:32
So second plants, all right, so that's one.
01:37
Second plants increase oxygen.
01:39
We all know that.
01:41
So we have photosynthesis.
01:44
Here i'll write a little photosynthesis equation.
01:48
We have co2 and h2o and of course sun's energy.
01:55
And those are going to lead to c...