CO₂ contributes ______ percent to global warming.

Ozone layer is present in ______________.

Greenhouse effect is ________________.

_____________is not the CO₂ emitters.

__________is mainly responsible for greenhouse effect.

___________is not a greenhouse gas.

_________ do not produce carbon dioxide.

Global warming is the visible rise in the _______ of the Earth’s climate system.

Global warming is also known as___________.

What will happen if human impact of greenhouse gas is reduced?

• There are both natural and human-caused greenhouse gases. 

__________is not associated with climate change.

What can be done to prevent climate change?

__________ is a greenhouse gas.

• They are referred to as greenhouse gases because, like the glass of a greenhouse, they let visible light from the Sun pass through the atmosphere and they absorb long-wavelength infrared energy from the Earth and keep the atmosphere warm.
• Greenhouse gases include carbon dioxide, methane, nitrous oxide and other gases that accumulate in the atmosphere and create the heat-reflective layer.

Which of the following is explained by theory of plate tectonics?

• Big Bang theory explains how the universe began.
• Gravity is not same everywhere on Earth, but it varies because the planet is not perfectly spherical or uniformly dense and also due to it's rotation.
• Since the forces that generate our magnetic field are constantly changing, the field itself is also in continual flux, its strength waxing and waning over time.

Due to the divergence of plates, magma from the mantle to reach the surface of the Earth as____.

The main causes of sea level rise is ___________.