Hi, I just downloaded minecraft and when I join my minecraft world with default textures I place a few leaves block on the ground for my decoration for my house and when I walk far from the leave block it turns black underneath and on the sides of the leaves. When I walk closer it goes away.

Pls help because my laptop spec are

1035gi Intel core I5
64 GB
1.9 ghz boosted up to 3.6
Windows 10