How long does core helium burning last in a star compared with core hydrogen burning?

Plzz worth 22 ! which statement about energy transformations is not true? a all forms of energy can be transformed into thermal b energy is never destroyed or created during transformations c potential chemical energy always transforms into kinetic d some thermal energy is always released during a transformation

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves