The earth was just {#blank#}1{#/blank#} cloud of dust after the "Big Bang". The earth exploded loudly with fire and rock. {#blank#}2{#/blank#} were in time to produce many things，which were to make the earth's atmosphere. As the earth cooled down，water began to appear on{#blank#}3{#/blank#}surface. It allowed the earth to dissolve {#blank#}4{#/blank#} gases. Then life began to develop.

    Small plants multiplied and filled the first oceans and seas with oxygen. This encouraged the development of early shellfish and fish. Land animals such {#blank#}5{#/blank#}insects, reptiles and dinosaurs appeared after green plants appeared. Small clever animals spread all {#blank#}6{#/blank#} the earth. They {#blank#}7{#/blank#} putting too much carbon dioxide into the atmosphere, which prevents heat from {#blank#}8{#/blank#} from the earth into space. Whether life will continue on the earth for millions of years to come will depend {#blank#}9{#/blank#} whether this problem {#blank#}10{#/blank#} be solved.