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Week 2.6

reflection is - the BOUNCING of light when it hits a smooth, shiny surface
refraction is - the BENDING of light when it travels through a new medium like glass or water
objects that reflect - mirror, smooth metals, tinted glass, dark TV screen
objects that refract - water, lenses, prisms, microscope, telescope, magnifying glass, hand lens
How does light travel? in straight lines, even after being reflected or refracted
Deltas are formed by - water (river) deposition
Sand dunes are formed by - wind erosion & deposition
Valleys are formed by - glacier (ice) erosion
Canyons are formed by - water (river) erosion
Which soils allow the most water to pass through? gravel or sandy soil
Which soils are most absorbent (hold the most water) humus
What force holds the planets in their orbits? gravity from the sun
Processes cause by the sun evaporation, wind formation, photosynthesis
Processes NOT caused by the sun volcano eruption, earthquakes, weathering and erosion
Weathering - rocks are BROKEN down into sediment
Erosion - sediment is MOVED from one place to another
Deposition - sediment is DROPPED in a new location
Sedimentary Rock formation - weathering, erosion, deposition, heat & pressure cause compaction, cementation, millions of years
Compaction - sediments are "squeezed" together and made smaller
Cementation - sediments become "glued" together to form a sedimentary rock
Thermal energy is - heat energy
Mechanical energy is - movement energy
When looking at layers in sedimentary rock, which layer is the YOUNGEST? the top layer
When looking at layers in sedimentary rock, which layer is the OLDEST? the bottom layer
Fences on the beach can help prevent - erosion of sand
How does the Sun power the water cycle? The Sun causes water on Earth's surface to evaporate
What adaptation would help birds migrate? strong wings

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