(a) The Earth's rocks, oceans and its atmosphere provide everything we need for life and human development.

(b) The Earth has a boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic structure consisting of the boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic (dense metal centre), boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic (hot 'semi-plastic' rock) and the crust.

(c) Scientists once thought that the features of the Earth’s surface were the result of the boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic of the crust as the Earth boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic down following its formation.

(d) The Earth’s crust and the upper part of the mantle are cracked into a number of large pieces called boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic.

(e) Within the Earth’s mantle there are boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic, driven by heat released by natural boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic processes, cause the plates to move at relative speeds of a few centimetres per year.

(f) Large-scale movements of the Earth’s crust can cause changes in the rocks and boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic builds up and eventually it is released causing massive movements that can be sudden and disastrous and boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic.

(g) Both boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic and/or boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic occur at the boundariesconvectioncooledcorecurrentsearthquakeseruptionslayeredmantleplatesradioactiveshrinkingstresstectonicunpredictablevolcanic between tectonic plates.