based on civil substructure course, slecect the most appropriate answerQuestion 21 Crib cofferdams are used Neither of the alternatives are correct. in fast-flowing rivers. with strong tides. Both of the alternatives are correct. 1 points Question 22 Terratecture is suited to many Australian climates, because Internal temperatures do not vary much. Daylighting is uniform throughout the house. Airflow is excellent within the building. These buildings do not have waterproofing problems. 1 points Question 23 Because of their location, substructures can be subjected to problems, such as: Wave action. Two of the alternatives are correct Flooding Bushfires 1 points Question 24 Water-logged sites can be stabilized by ground freezing, because: increases the permeability of foundations. Two of the alternatives are correct. the frozen ground has increased strength. groundwater cannot enter the site