Ozone protects the Earth from harmful ultraviolet (UV) rays from the Sun. Without the Ozone layer in the atmosphere, life on Earth would be very difficult. Plants cannot live and grow in heavy ultraviolet radiation, nor can the planktons that serve as food for most of the ocean life. With a weakening of the Ozone Layer shield, humans would be more susceptible to skin cancer, cataracts and impaired immune systems.
D. More than 1,000 languages are spoken in Africa.
There's estimated about 1,500 to 2,000 African languages.
Answer: Option (1)
Explanation:
When an oceanic plate collides with a continental plate, the denser oceanic plate gets subducted beneath the less denser continental plate, and this down-going slab undergoes partial melting at greater depth known as the subduction zone, which forces the magma to rise up and form volcano on the over-riding plate.
These volcanoes are of three types, namely the composite, dome and shield volcano. For example, Mount Vesuvius and Mount Fuji.
Thus, the correct answer is option (1).