Grade 7 Science - Trimester 3 Revision Pack - Comprehensive Notes
Multiple Choice Questions
Rust is produced by the oxidation of iron.
Sunlight does NOT directly contribute to the abrasion of rocks.
Plants can erode rock with their roots.
Earthworms erode soil by burrowing and tunneling in the soil.
Lichens contribute to chemical weathering.
The oxidation of iron produces a reddish soil.
Ice wedging is a type of mechanical weathering.
Ice carries the largest and heaviest rocks.
Igneous rock forms deep within the Earth when magma solidifies.
Metamorphic rock forms under high temperature and pressure but is not exposed to enough heat to melt the rock.
After deposition, sediments turn into sedimentary rock when they are compacted and cemented.
An igneous rock with a coarse-grained texture forms when magma cools very slowly.
Sandstone is an example of clastic sedimentary rock.
Basalt is an example of mafic igneous rock.
Weathering causes the breakdown of rock.
Metamorphic rock is most likely to form when limestone comes in contact with an igneous intrusion.
Phyllite, formed from shale, is a metamorphic rock.
Coarse-grained granite cooled very slowly.
Chiseling is NOT part of the rock cycle.
All types of rock (igneous, sedimentary, and metamorphic) can weather and wear away to form sediment.
The weathering and wearing away of rock into sediment is called erosion.
Fossils are the remains or traces of plants and animals that have been preserved in sedimentary rock.
The word metamorphic comes from meta- and morphos- meaning "changed shape."
All types of rock (igneous, sedimentary, and metamorphic) can change into metamorphic rock.
The ancient continent that contained all the landmasses is called Pangaea.
Mid-ocean ridges are associated with divergent boundaries.
The distribution of Lystrosaurus fossils suggests that Antarctica, India, and South Africa were once connected to one another.
Magma that reaches the Earth's surface may form volcanic mountains.
The lithosphere is made up of tectonic plates.
Convection currents below the lithosphere appear to cause movement of Earth's tectonic plates.
Earth's lightest materials make up the crust.
Earth's oceanic crust is thinner but denser than the continental crust.
The outermost, rigid layer of the Earth is called the lithosphere.
The word lithosphere means "rock sphere."
Tectonic movements are generally measured in centimeters per year.
In the diagram, a mid-ocean ridge has formed at A.
In the diagram, a volcanic mountain has formed at B.
In the diagram, a divergent boundary is occurring at A.
In the diagram, sea-floor spreading is occurring at A.
The existence of convection currents was NOT used as evidence to support the theory of continental drift.
Completion Questions
The cooling rate of magma affects the properties of igneous rock.
Rock is a solid mixture of crystals of one or more minerals.
The rock cycle is the process by which one rock type changes into another.
The ridge in the middle of the Atlantic Ocean formed along a divergent boundary.
The lithosphere is divided into pieces called tectonic plates.