C2a - Structure of the Earth 5.0 / 5 based on 1 rating ? ChemistryThe earth and its atmosphereGCSEOCR Created by: natalie27Created on: 16-12-13 11:22 843210179 Across 1. Silica rich magma has a _______ consistency so it explodes and is more dangerous. Forms silica rich rhyolite. (7) 2. ______ rock UNDER the ground is called magma. ______ rock on the Earth's SURFACE is called lava. (6) 4. Thin rocky layer. (5) 7. In 1914 Wenger suggested that over millions of years, the continents have moved - called the ___________ drift theory. (11) Down 2. This is between the crust and the core. It is cold and rigid just below the crust, at greater depths hot and non-rigid so able to move. (6) 3. Scientists study volcanoes to _______ when they will erupt - they cannot be 100% certain. (7) 4. Thermal energy from the Earth's core causes __________ currents in the mantle - kinetic energy transferred to tectonic plates. (10) 8. The Earth's crust is split into ________ plates. The plates move very slowly as a result of convection currents in the non-rigid mantle. (8) 9. This is what the core is made out of. (4) 10. If molten rock cools _______, SMALL crystals are formed, e.g. basalt. (7)
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