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17 Pests often develop resistance to chemical pest controls over the years. What make the pests become resistant? A change in crop type B change in pests' DNA C change in soil fertility D change in rainfall patterns The picture shows two tectonic plates moving under the ocean. Molten lava flows out from the mantle between the two plates. continent 1 ocean constructive boundary continent 2 plate 1 magma plate 2 convection convection current current mantle 18 What causes the plates to move? A water pressure B friction at the plate boundary C movements of materials in the mantle D the mass of continents 1 and 2 19 What is a likely effect of the plates moving apart? A The ocean level rises. B The ocean floor spreads out. C The mass of the Earth will increase. Continents 1 and 2 move closer to each other. 20 Why is this type of plate boundary called a "constructive boundary"? A New crust material is formed at the boundary. B New continents are formed near the boundary. C New tectonic plates are formed at the boundary. D Older crust sinks down into the mantle near the boundary