tileControl.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class tileControl : MonoBehaviour
{
    // Start is called before the first frame update
    public string tileType;//if its lava if its grass etc


    private void OnCollisionEnter(Collision objectHit)
    {
        if (objectHit.gameObject.tag == "Player")//if player walks on tile do follwoing
        {
            if (tileType == "lava")//if lava push player up and later do damage or kill player
            {
                GameObject player = GameObject.FindGameObjectWithTag("Player");//find the player object
                player.GetComponent<Rigidbody>().AddForce(0, 10, 0, ForceMode.Impulse);//add force to make him fly up
            }

        }
    }
}