[ 1 ] GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Earth and Space Science Select the best answer to fill each blank from the choices that follow. The _______ is a solid mass of iron with a temperature of about 7,000°F. The _______ is a mass of molten iron that surrounds the solid inner core. Electrical currents generated from this area produce Earth’s magnetic field. The _______ is composed of silicon, oxygen, magnesium, iron, aluminum, and calcium and is about 1,750 miles thick. When parts of this layer become hot enough, they turn to slow-moving molten rock or magma. The _______ is a layer from 4 to 25 miles thick, consisting of sand and rock. • outer core • crust • inner core • rocky mantle Select the best answer to fill each blank from the choices that follow. Sunlight _______ water from the oceans, rivers, and lakes. Living beings need water for both the outside and the inside of their cells. In fact, vertebrates (you included) are about 70% water. Evaporated water _______ to form clouds that produce rain or snow onto the earth’s surface (_______). • precipitation • evaporates • condenses