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Earth & space Choose questions individually, practise online, or create a worksheet with matching answers. Counts include generated variants, not only authored originals.
Sample exercises Grades 5–9 · Earth & space What process forms an igneous rock in the basic model? Cooling and solidification of molten material. Every type of evaporation. Only compacting plastic litter. Answer and explanation Cooling and solidification of molten material.
Igneous rock forms from magma or lava cooling.
Grades 5–9 · Earth & space What can transform existing rock without fully melting it? Removing every atom. Heat and pressure during metamorphism. Only writing a new label. Answer and explanation Heat and pressure during metamorphism.
Metamorphic change occurs under changed conditions without complete melting in the basic distinction.
Grades 5–9 · Earth & space Must every rock pass through the same cycle steps in the same order? Yes, exactly once each. Only if it contains quartz. No. Answer and explanation No.
The cycle shows alternative pathways.
Grades 5–9 · Earth & space A fictional sediment layer is 2 cm thicker each year for 5 years under a stated model. What added thickness is predicted? Answer and explanation 10 cm
2 × 5 = 10 cm; real deposition need not be constant.
Grades 5–9 · Earth & space Why should a simple layer-rate calculation not be treated as a universal geological clock? Answer and explanation Deposition, erosion and compaction can vary over time.
The rate assumption is limited.
Grades 5–9 · Earth & space What is weathering? All melting deep in Earth. Breakdown or alteration of material at or near the surface. Only transport by a river. Answer and explanation Breakdown or alteration of material at or near the surface.
Weathering differs from the transport commonly called erosion.
Study notes Read the rock cycle as possible pathways, not one compulsory loop.
Grades 5–9 Read the rock cycle as possible pathways, not one compulsory loop.
Grades 5–9 Distinguish rotation, orbit and axial tilt.
Grades 6–10 Distinguish rotation, orbit and axial tilt.
Grades 6–10