Last Science Test Year 7 Definitions Flashcards
Agents of erosion
Water, wind, ice
Atmosphere
Layer of gases above the earth’s surface
Deposition
When sediments drop out of water, air or ice
Erosion
The movement of sediments away from the place of their formation or deposition
Humus
Decaying plants and animals, and their waste
Igneous rock
Rock formed by the cooling of molten rock (lava)
Minerals
Substances formed in rocks
Non-renewable resource
A resource that takes longer than the average human lifespan to be replaced
Photosynthesis
The process by which plants use carbon dioxide, water and sunlight to make food
Renewable resource
A resource that is always being replaced naturally
Resource
Something that satisfies a particular purpose or need
Sediment
Material such as silt and sand that is transported and deposited by water, ice and wind, and forms layers on the Earth’s surface. In time it can be compacted to form a sedimentary rock
Sedimentary rock
Rock formed by compacting and sticking together of sediments
E.g. Sandstone
Weathering
The process of breaking down rocks into smaller pieces
Fossil fuels
Fuels such as natural gas, oil and coal, formed from the remains of living things buried millions of years ago.
Hydroelectricity
The process of using water falling from a height to turn turbines and generate electricity
Solar cell
A device that absorbs solar energy and converts it directly into electrical energy
Aquifer
I layer of pervious pervious rock from which water can be extracted using a bore or well.
Groundwater
Water that exists underground
Humidity
The amount of water vapour in the air
Impervious rock
Rock that does not allow water to soak into it
Percolation
The process of water soaking into the soil
Pervious rock
Rock that allows water to soak into it
Run-off
Rainwater nor absorbed by the soil
