<p class="ql-block"><b>Game1-Review Preposition </b></p><p class="ql-block">M: honey, I am going to play a funny game with you. Let’s put a bathtub between us. I am your leader. You must do what I say. If you don’t do the action, you will get a punishment.</p> <p class="ql-block"><b>Game2-Giving direction </b></p><p class="ql-block">M: Honey, when someone get lost on the street. He ask us for help. Would you like to lend him a helping hand?</p><p class="ql-block">B:</p><p class="ql-block">M: Great! Helping Others is happiness. Before that, we must learn something about the direction. Look at these sighs, I will show you one by one. </p><p class="ql-block"><br></p> <p class="ql-block">Here is a town. You are local people who are familiar with everything in the town. I am a visitor from other town. I come to visit my friends. But I get lost in the town. I need some help. I am going to ask for direction. </p> <p class="ql-block"><b>Review water cycle </b></p><p class="ql-block">M: honey, when you get thirsty, what will you do?</p><p class="ql-block">B: Drink some water</p><p class="ql-block">M: yes. When we are thirsty, we will take a drink. Water is one kind of sources that we need to survive on the earth. But the amount of water is limited, It change around and around in something called the water cycle. Look at the picture of water cycle.</p><p class="ql-block">Evaporation—With the help of Heat from the sun or other sources ,water on the surface of rivers, lakes and oceans heats up and evaporate into water vapor which goes into air.</p><p class="ql-block">Condensation—Water vapor raises up into the sky. Up into the cooling part of the atmosphere , they change back into liquid and form the clouds.</p><p class="ql-block">Precipitation—With the help of heat again, Condensed water Vapor in the cloud falls to the Earth’s surface such as rain, snow and hail.</p><p class="ql-block">The whole process is repeated without stopping and so it is referred to as Water Cycle.</p> <p class="ql-block"><b>How hydropower works</b></p><p class="ql-block">Build a dam to store water in the reservoir.</p><p class="ql-block">Dam is built barrier to control the flow of water.</p><p class="ql-block">Gravity causes the water to flow down</p><p class="ql-block">The turbine is turned by the force of the falling water.</p><p class="ql-block">The spinning turbine turns the Generator.</p><p class="ql-block">The Generator convert the spinning power into electricity.</p><p class="ql-block">The electricity is exported to the grid which will export the electricity to our house.</p> <p class="ql-block"><b>拓展—how does a tornado form</b></p><p class="ql-block">Tornado is one of nature disasters which can bring damage for us. Most of tornadoes start as bad storms with heavy rain, thunder and lightning. A tornado is born when very fast, strong winds spin and touch the ground. </p><p class="ql-block">Weak tornadoes damage trees and sighs. Strong tornadoes destroy buildings. We must follow some rules to stay safe in a tornado </p><p class="ql-block">1-Listen to weather reports.</p><p class="ql-block">2-Move to a room without windows.</p><p class="ql-block">3-Stay away from windows</p><p class="ql-block">4-Listen to the direction from a parent or teacher</p> <p class="ql-block">Warm, Humid low-pressure air rises, creating a strong updraft. The strong updraft punch through cold dry high-pressure air. Opposing winds create rotation. If the rotation is violent enough, a funnel forms and drops to the ground. A tornado is formed. </p><p class="ql-block"><br></p>