Essentially, deforestation occurs from two sources: clearing (chopping down) trees and burning (fires). The latter isn't always caused by humans; it could be caused naturally by such as lightning.
The adverse effects of deforestation are too numerous and involved to be listed here. Here are some articles that explain the process and its effects in detail:
http://en.wikipedia.org/wiki/Deforestation#Atmospheric
http://www.umich.edu/~gs265/society/deforestation.htm
http://earthobservatory.NASA.gov/Features/Deforestation/
http://www.nationalgeographic.com/eye/deforestation/effect.html
Floods are cause of human activities. Some of the activities are growing population, deforestation and global warming.
humans are making the sea level rise so there is more rain and floods
Natural disasters such as earthquakes, hurricanes, and tsunamis are caused by natural processes and phenomena, not by human activities. However, human activities can contribute to the severity or impact of some natural disasters, such as deforestation increasing the risk of landslides or urban development increasing the damage from floods.
Human activities that contribute to the increase of carbon dioxide in the atmosphere include burning fossil fuels for energy, deforestation, and industrial processes.
its formed by a occulded front
Human activities contribute to the destruction of the environment through activities like deforestation, pollution, overfishing, and greenhouse gas emissions. These actions can lead to habitat destruction, loss of biodiversity, climate change, and other negative impacts on the environment.
use of paper cups, tissue papers
Humans can start planting or cutting tree's in a sensitive certain area which can cause water to easily make soil slide down and cause floods.
they are caused by frequent rain, heavy thunderstorms and snow melt they can also occur when storms blow on shore and pile ocean water against the coast.
Floods can be caused or exacerbated by human activities such as deforestation, urban development, and poor land management practices that can lead to increased runoff and flood risk. Climate change can also contribute to more frequent and severe flooding events.
Some causal factors of disasters include natural events like hurricanes, earthquakes, and floods, as well as human activities such as deforestation, urbanization, and inadequate infrastructure. Climate change can also contribute to the frequency and intensity of disasters. Additionally, lack of preparedness, poor governance, and socioeconomic vulnerabilities can exacerbate the impact of disasters.
Floods can be predicted to some extent using advanced technology and historical data, but their exact timing and severity are difficult to forecast accurately. Factors such as weather patterns, soil conditions, and human activities can all contribute to the unpredictability of flooding events.