(26) In using the electrical resistivity method, a current is generated in the field of frequency

Unclear question

However, I inferred this to be the clear rendering of the question;

Specify four types of soils in Romania and the relief units in which they are found.

Explanation:

Soil types:

1. Kastanozems

2. Prepodzols

3. Districambosols

4. Luvosols

Reliefs found

1. Kastanozems- are mainly found in plains, plateaus, and lowlands.

2. Prepodzols- this type of soil is unique for it is been found in mountains.

3. Districambosols- it is found in high Hills and mountainous areas.

4. Luvosols- located in plains and high plateaux.