ProteX:

PsleStudent:

The gas called ozone protects the earth from the direct rays from the sun by forming a layer in the atmosphere. If not this layer the heat of the sun will get to the earth directly. When this ozone layer is depleted through the action of some chemicals man has no shelter again from the ultraviolent rays of the sun which can cause sunburn and skin cancer. There are also other negative effects of this ray from the sun.

But is the ozone layer completely depleted? If not, then the sun won't directly heat the Earth, right?

hmm... As for that i think for that, your opinion should be correct. As i think the ozone layer is not COMPLETELY depleted,there will still be a shelter but i think there would be more UV rays passing through the ozone layer? i am also not so sure about that...

The gas called ozone protects the earth from the direct rays from the sun by forming a layer in the atmosphere. If not this layer the heat of the sun will get to the earth directly. When this ozone layer is depleted through the action of some chemicals man has no shelter again from the ultraviolent rays of the sun which can cause sunburn and skin cancer. There are also other negative effects of this ray from the sun.

Actually u are right… When the ozone layer is depleted, the sun will heat up the earth directly… As, the ozone layer is just like a shelter,when the shelter is destroyed, u have no shelter to protect u thus the sun will directly heat up the earth…

Deforestation is the cutting down large numbers of trees to use the land for something instead of a forest. Cutting down trees can affect the climate. After rain falls on a forest, mist rises and new rain clouds form. When forests are cut down, this cycle is disrupted, and the area eventually grows drier, causing a change in the local climate. If huge areas of trees are cut down, the carbon dioxide they would have used builds up in the atmosphere and contributes to the greenhouse effect. And without trees to hold the soil and absorb water, rain washes topsoil away, a process called soil erosion.


Just sharing some informations

Global warming refers to an average increase in the Earth's temperature, which in turn causes changes in climate. A warmer Earth may lead to changes in rainfall patterns, a rise in sea level, and a wide range of impacts on plants, wildlife, and humans. When scientists talk about the issue of climate change, their concern is about global warming caused by human activities.


Hopes this help

Global warming refers to an average increase in the Earth's temperature, which in turn causes changes in climate. A warmer Earth may lead to changes in rainfall patterns, a rise in sea level, and a wide range of impacts on plants, wildlife, and humans. When scientists talk about the issue of climate change, their concern is about global warming caused by human activities.


Hopes this help

[quote="Verysuperkiasu"]Posted this on science thread but no answer. does anyone know the answer? desperate…no one answered yet.


Question:
Cutting down of trees will cause the phenomenon ‘global warming’. Which of the following are involved in global warming?
A: burning of trees causes the carbon in the tree to combine with oxygen in the air to form carbon dioxide.
B: Carbon dioxide in the atmosphere acts as a blanket to trap heat in the Earth.
Without trees, Sun heats up te Earth’s surface directly.
Soil erosion will destroy aquatic life forms, which in turn will enhance global warming subsequently.

(1) A and B only
(2) A, B and C only
(3) A, B and D only
(4) A, B, C and D

Answer is (4). My son doesn’t think C and D are involved in global warming. Is he correct or is he wrong. His answer is (1).[/quote

Actually I can only explain option d u see cutting down trees will surely cause soil erosion will destroy aquatic life forms u see… When trees are cut down , there will be lesser trees taking in carbon dioxide which cause an increase in carbon dioxide warming up the environment which is global warming… As for option c , I am not too sure…