where do you find trades?
They are found in the tropics near the Earth's equator, equatorward of the subtropical ridge.
Prevailing winds
The trade winds (also called trades) are the prevailing pattern of easterly surface winds found in the tropics near the Earth's equator, equatorward of the subtropical ridge. 
explain the relationship between wind patterns in the southern pacific The westerlies together with the trade winds, lead to the development of strong ocean currents in both hemispheres. what is its effect on environment? Insects are swept along by the prevailing winds, while birds follow their own course. Wind erosion of agricultural land is also a significant problem. what is a wind rose? It is a graphic tool used by meteorologists to give a succinct view of how wind speed and direction are typically distributed at a particular location.
wiki:17811999
Prevailing winds [SEP] Trades and their impact
The trade winds (also called trades) are the prevailing pattern of easterly surface winds found in the tropics near the Earth's equator, equatorward of the subtropical ridge. These winds blow predominantly from the northeast in the Northern Hemisphere and from the southeast in the Southern Hemisphere. The trade winds act as the steering flow for tropical cyclones that form over world's oceans, guiding their path westward. Trade winds also steer African dust westward across the Atlantic Ocean into the Caribbean sea, as well as portions of southeast North America.