pub fn micrometeorite_overturn_rate_mm_myr(flux_index: f64) -> f64 {
0.3 + 1.5 * flux_index.max(0.0)
}
pub fn cryoresurfacing_rate_mm_yr(heat_flux_mw_m2: f64) -> f64 {
heat_flux_mw_m2.max(0.0) * 0.12
}
pub fn space_weathering_index(exposure_myr: f64, solar_wind_factor: f64) -> f64 {
(1.0 - (-exposure_myr / 80.0).exp()) * solar_wind_factor.max(0.0)
}