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library(terra)
## terra version 1.0.10
r <- rast(ncol=10, nrow=10, xmin=-150, xmax=-80, ymin=20, ymax=60)

r
## class       : SpatRaster 
## dimensions  : 10, 10, 1  (nrow, ncol, nlyr)
## resolution  : 7, 4  (x, y)
## extent      : -150, -80, 20, 60  (xmin, xmax, ymin, ymax)
## coord. ref. : +proj=longlat +datum=WGS84 +no_defs
values(r) <- runif(ncell(r))
r
## class       : SpatRaster 
## dimensions  : 10, 10, 1  (nrow, ncol, nlyr)
## resolution  : 7, 4  (x, y)
## extent      : -150, -80, 20, 60  (xmin, xmax, ymin, ymax)
## coord. ref. : +proj=longlat +datum=WGS84 +no_defs 
## source      : memory 
## name        :     lyr.1 
## min value   : 0.0116282 
## max value   : 0.9787912
plot (r)

values(r) <- 1:ncell(r)
r
## class       : SpatRaster 
## dimensions  : 10, 10, 1  (nrow, ncol, nlyr)
## resolution  : 7, 4  (x, y)
## extent      : -150, -80, 20, 60  (xmin, xmax, ymin, ymax)
## coord. ref. : +proj=longlat +datum=WGS84 +no_defs 
## source      : memory 
## name        : lyr.1 
## min value   :     1 
## max value   :   100
plot (r)

r2 <- r * r
r3  <- sqrt(r)
s <- c(r, r2, r3)

plot(s)