Answer:
Varnish can prevent scratches and abrasions on table tops. As well as waterproofing the wood, varnish can also prevent wooden surfaces from getting scratched. Finishing wood with a product such as varnish, serves to protect wood from the little knocks and spills that are inevitable in a busy family home.
Explanation:
Trees and plants release oxygen. As the main source of oxygen for us, most animals would likely die, including us.
Answer:
about 2 - 4 hours is alright
Explanation:
up to 6 hours you will feel pain in your eyes
