  The Universe's Cosmic Dawn (CD) and Epoch of Reionization (EoR) can be
studied using a number of observational probes that provide complementary or
corroborating information. Each of these probes suffers from its own systematic
and statistical uncertainties. It is therefore useful to consider the mutual
information that these data sets contain. In this paper, we discuss a potential
of cross-correlations between the SKA cosmological 21 cm data with: (i) the
kinetic Sunyaev- Zel'dovich (kSZ) effect in the CMB data; (ii) the galaxy
surveys; and (iii) near infrared (NIR) backgrounds.
