the TweenService in my script wont work?

script.Parent:WaitForChild("RemoteEvent").OnServerEvent:Connect(function(player)
	local terrainPart = game:GetService("ReplicatedStorage"):WaitForChild("TerrainPart"):Clone()
	local tween = game:GetService("TweenService")
	terrainPart.Position = player.Character.HumanoidRootPart.Position+Vector3.new(math.random(0,20),0,math.random(0,30))-Vector3.new(0,10,0)
	terrainPart.CanCollide = false
	terrainPart.Anchored = true
	terrainPart.Parent = game.Workspace
	tween:Create(terrainPart,TweenInfo.new(5),{Position = Vector3.new(0,10,0) + terrainPart.Position})
end)

Im trying to make a part emerge from the ground after it being cloned, but the part isnt moving at all. Anyone can figure out why?