Add spaces: Adoublinginrunoffspeeddownaslopegiveswaterfourtimesasgreaterosiveforceonthesoil.

Answer: A doubling in runoff speed down a slope gives water four times as great erosive force on the soil.

Add spaces: Whilesomebelieveasbestos-relateddiseaseisa"thresholdphenomenon,"whichrequiresacertainlevelofexposurefordiseasetooccur,othersbelievethereisnosafelevelofasbestos.

Answer: While some believe asbestos-related disease is a "threshold phenomenon," which requires a certain level of exposure for disease to occur, others believe there is no safe level of asbestos.

Add spaces: TheRoyalBoatHousewasbuiltatthebeginningoftheseventeenthcenturybyChristianIV.

Answer:
The Royal Boat House was built at the beginning of the seventeenth century by Christian IV.