Changes in the skills base and knowledge our students need require new learning goals; these new learning goals change the relationship between assessment and instruction. Teachers need to take an active role in making decisions about the purpose of assessment and the content that is being assessed.
Titanite, or sphene (from the Greek sphenos (ÏÏÎ·Î½Ï), meaning wedge), is a calcium titanium nesosilicate mineral, Ca Ti Si O 5.Trace impurities of iron and aluminium are typically present. Also commonly present are rare earth metals including cerium and yttrium; calcium may be partly replaced by thorium.ue depends on Fe content, with low Fe content causing green and yellow colours, and high Fe content causing brown or black hues. Zoning is typical in titanite. It is prized for its exceptional dispersive power (0.051, B to G interval) which exceeds that of diamond.
The chemical formula for water is H2O. It means that a water molecule contains 2 Hydrogen atoms (H) and 1 Oxygen atom (O).2O (g) as it is water but just a gas Ice would be similar but just with a change of state symbol, Correction-water vapour/steam has the chemical formula of 7H20, and it w â¦ ater has never been broken down to H20 although it is generally assumed.